feat(alerting): ClickUp alerting provider (#1462)

* feat(alerting): Add ClickUp alerting provider

* test: added ClickUp tests, docs in README and switch http to github.com/TwiN/gatus/v5/client from http.Client

* docs: Update ClickUp API token instructions in README

* fix(alerting): Update ClickUp alert configuration and default values

* docs: fixed formatting and removed line breaks from content in README

* feat(alerting): Add group-specific overrides and validation checks, updated README

* Update alerting/provider/clickup/clickup.go

Co-authored-by: PythonGermany <97847597+PythonGermany@users.noreply.github.com>

* fix(alerting): add priority validation

* fix(alerting): set default priority to 3

* feat(alerting): add priority map for ClickUp provider

* feat(alerting): make notify-all configurable for ClickUp provider

* docs: add instructions for finding Assignee IDs for ClickUp

* refactor(alerting): simplified ClickUp configurations example

* refactor(alerting): clean up new lines  in ClickUp provider

---------

Co-authored-by: PythonGermany <97847597+PythonGermany@users.noreply.github.com>

.examples/docker-compose-grafana-prometheus/compose.yaml

@@ -1,4 +1,3 @@
-version: "3.9"
 services:
   gatus:
     container_name: gatus
@@ -13,7 +12,7 @@ services:
 
   prometheus:
     container_name: prometheus
-    image: prom/prometheus:v2.14.0
+    image: prom/prometheus:v3.5.0
     restart: always
     command: --config.file=/etc/prometheus/prometheus.yml
     ports:
@@ -25,7 +24,7 @@ services:
 
   grafana:
     container_name: grafana
-    image: grafana/grafana:6.4.4
+    image: grafana/grafana:12.1.0
     restart: always
     environment:
       GF_SECURITY_ADMIN_PASSWORD: secret

.examples/docker-compose-grafana-prometheus/config/config.yaml

@@ -16,4 +16,10 @@ endpoints:
     url: https://api.github.com/healthz
     interval: 5m
     conditions:
-      - "[STATUS] == 200"
+      - "[STATUS] == 200"
+
+  - name: check-domain-expiration
+    url: "https://example.org/"
+    interval: 1h
+    conditions:
+      - "[DOMAIN_EXPIRATION] > 720h"

.examples/docker-compose-mattermost/compose.yaml

@@ -1,4 +1,3 @@
-version: "3.9"
 services:
   gatus:
     container_name: gatus

.examples/docker-compose-mtls/certs/client/client.crt

@@ -0,0 +1,29 @@
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----

.examples/docker-compose-mtls/certs/client/client.key

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+-----BEGIN RSA PRIVATE KEY-----
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+-----END RSA PRIVATE KEY-----

.examples/docker-compose-mtls/certs/server/ca.crt

@@ -0,0 +1,29 @@
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----

.examples/docker-compose-mtls/certs/server/server.crt

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+-----BEGIN CERTIFICATE-----
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+eOk=
+-----END CERTIFICATE-----

.examples/docker-compose-mtls/certs/server/server.key

@@ -0,0 +1,51 @@
+-----BEGIN RSA PRIVATE KEY-----
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+pix0bXJtZE7WfFfesQIxGffVBhgN3UgqhAf2wquHgm1O17JXrmkR6JSYNpKc
+-----END RSA PRIVATE KEY-----

.examples/docker-compose-mtls/compose.yaml

@@ -0,0 +1,26 @@
+services:
+  nginx:
+    image: nginx:stable
+    volumes:
+      - ./certs/server:/etc/nginx/certs
+      - ./nginx:/etc/nginx/conf.d
+    ports:
+      - "8443:443"
+    networks:
+      - mtls
+
+  gatus:
+    image: twinproduction/gatus:latest
+    restart: always
+    ports:
+      - "8080:8080"
+    volumes:
+      - ./config:/config
+      - ./certs/client:/certs
+    environment:
+      - GATUS_CONFIG_PATH=/config
+    networks:
+      - mtls
+
+networks:
+  mtls:

.examples/docker-compose-mtls/config/config.yaml

@@ -0,0 +1,13 @@
+endpoints:
+  - name: example
+    url: https://nginx
+    interval: 30s
+    conditions:
+      - "[STATUS] == 200"
+    client:
+      # mtls
+      insecure: true
+      tls:
+        certificate-file: /certs/client.crt
+        private-key-file: /certs/client.key
+        renegotiation: once

.examples/docker-compose-mtls/nginx/default.conf

@@ -0,0 +1,16 @@
+server {
+    listen                  443 ssl;
+
+    ssl_certificate         /etc/nginx/certs/server.crt;
+    ssl_certificate_key     /etc/nginx/certs/server.key;
+    ssl_client_certificate  /etc/nginx/certs/ca.crt;
+    ssl_verify_client       on;
+
+    location / {
+      if ($ssl_client_verify != SUCCESS) {
+        return 403;
+      }
+      root   /usr/share/nginx/html;
+      index  index.html index.htm;
+    }
+}

.examples/docker-compose-multiple-config-files/compose.yaml

@@ -1,4 +1,3 @@
-version: "3.8"
 services:
   gatus:
     image: twinproduction/gatus:latest

.examples/docker-compose-multiple-config-files/config/global.yaml

@@ -1,5 +1,4 @@
 metrics: true
-debug: false
 ui:
   header: Example Company
   link: https://example.org

.examples/docker-compose-postgres-storage/compose.yaml

@@ -1,4 +1,3 @@
-version: "3.9"
 services:
   postgres:
     image: postgres

.examples/docker-compose-sqlite-storage/compose.yaml

@@ -1,4 +1,3 @@
-version: "3.9"
 services:
   gatus:
     image: twinproduction/gatus:latest

.examples/docker-compose/compose.yaml

@@ -1,4 +1,3 @@
-version: "3.8"
 services:
   gatus:
     image: twinproduction/gatus:latest

.examples/nixos/README.md

@@ -0,0 +1,4 @@
+# NixOS
+
+Gatus is implemented as a NixOS module. See [gatus.nix](./gatus.nix) for example
+usage.

.examples/nixos/gatus.nix

@@ -0,0 +1,23 @@
+{
+  services.gatus = {
+    enable = true;
+
+    settings = {
+      web.port = 8080;
+
+      endpoints = [
+        {
+          name = "website";
+          url = "https://twin.sh/health";
+          interval = "5m";
+
+          conditions = [
+            "[STATUS] == 200"
+            "[BODY].status == UP"
+            "[RESPONSE_TIME] < 300"
+          ];
+        }
+      ];
+    };
+  };
+}

.github/assets/logo.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 89.76 89.75"><defs><style>.cls-1{fill:#3cad4b;}.cls-2{fill:#017400;}.cls-3{fill:#1e9025;}</style></defs><g id="Layer_2" data-name="Layer 2"><g id="Layer_1-2" data-name="Layer 1"><path class="cls-1" d="M33.67,65.35a23.35,23.35,0,0,1,.08-41,22.94,22.94,0,0,1,3.8-1.64A23,23,0,0,0,53.6,1C53,0,51,0,44.89,0c-9.08,0-9.21.17-8.81,3.22,1.07,8.12-9.42,12.5-14.45,6-1.94-2.52-2.1-2.52-8.68,4.16-6.22,6.3-6.33,6.28-3.77,8.25a8.09,8.09,0,0,1,2.56,9.53A8.15,8.15,0,0,1,3.08,36C0,35.63,0,35.73,0,45.2.08,53.81,0,54,3.3,53.63A8.06,8.06,0,0,1,9.76,67.52c-3,2.83-2.84,2.61,2.84,8.48,5.43,5.62,6.33,6.73,8.16,5.24L34,68A1.63,1.63,0,0,0,33.67,65.35Z"/><path class="cls-2" d="M85.43,36.13a8.11,8.11,0,0,1-5.27-14.21c2.85-2.5,2.82-2.37-3.55-8.75-4.31-4.31-5.71-5.75-6.87-5.4l-14,14a1.65,1.65,0,0,0,.36,2.61,23.35,23.35,0,0,1-.1,41,24.5,24.5,0,0,1-5.11,2c-8.54,2.28-14.73,9.63-14.73,18.47v1.27c.15,2.54,1.19,2.42,8.06,2.52,9.32.14,9.1.35,9.38-4.66a8.11,8.11,0,0,1,14-5.09c3,3.15,2.39,3.11,8.73-3.14,6.56-6.47,6.86-6.25,3.68-9.14a8.1,8.1,0,0,1,6.06-14.07c3.68.27,3.51.06,3.63-8.09C89.85,36.27,90,36.16,85.43,36.13Z"/><path class="cls-3" d="M41.11,59h8a.76.76,0,0,0,.77-.76V50.43a.76.76,0,0,1,.77-.76h7.84a.78.78,0,0,0,.77-.77V40.84a.77.77,0,0,0-.77-.76H50.7a.76.76,0,0,1-.77-.77V31.47a.76.76,0,0,0-.77-.77h-8a.76.76,0,0,0-.77.77v7.84a.76.76,0,0,1-.77.77H31.73a.77.77,0,0,0-.77.76V48.9a.78.78,0,0,0,.77.77h7.84a.76.76,0,0,1,.77.76v7.85A.76.76,0,0,0,41.11,59Z"/></g></g></svg>

.github/codecov.yml

@@ -1,12 +1,15 @@
 ignore:
-  - "watchdog/watchdog.go"
   - "storage/store/sql/specific_postgres.go" # Can't test for postgres
-
+  - "watchdog/endpoint.go"
+  - "watchdog/external_endpoint.go"
+  - "watchdog/suite.go"
+  - "watchdog/watchdog.go"
+comment: false
 coverage:
   status:
     patch: off
     project:
       default:
-        target: 75%
+        target: 70%
         threshold: null
 

.github/dependabot.yml

@@ -7,7 +7,7 @@ updates:
       interval: "daily"
   - package-ecosystem: "gomod"
     directory: "/"
-    open-pull-requests-limit: 1
+    open-pull-requests-limit: 3
     labels: ["dependencies"]
     schedule:
       interval: "daily"

.github/workflows/benchmark.yml

@@ -18,13 +18,13 @@ jobs:
   build:
     name: benchmark
     runs-on: ubuntu-latest
-    timeout-minutes: 5
+    timeout-minutes: 15
     steps:
-      - uses: actions/setup-go@v5
+      - uses: actions/setup-go@v6
         with:
-          go-version: 1.19
+          go-version: 1.24.4
           repository: "${{ github.event.inputs.repository || 'TwiN/gatus' }}"
           ref: "${{ github.event.inputs.ref || 'master' }}"
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - name: Benchmark
         run: go test -bench=. ./storage/store

.github/workflows/labeler.yml

@@ -0,0 +1,46 @@
+name: labeler
+on:
+  pull_request_target:
+    types:
+      - opened
+  issues:
+    types:
+      - opened
+jobs:
+  labeler:
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    permissions:
+      issues: write
+      pull-requests: write
+    steps:
+      - name: Label
+        continue-on-error: true
+        env:
+          TITLE: ${{ github.event.issue.title }}${{ github.event.pull_request.title }}
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GH_REPO: ${{ github.repository }}
+          NUMBER: ${{ github.event.issue.number }}${{ github.event.pull_request.number }}
+        run: |
+          if [[ $TITLE == "feat"* ]]; then
+            gh issue edit "$NUMBER" --add-label "feature"
+          elif [[ $TITLE == "fix"* ]]; then
+            gh issue edit "$NUMBER" --add-label "bug"
+          elif [[ $TITLE == "docs"* ]]; then
+            gh issue edit "$NUMBER" --add-label "documentation"
+          fi
+          if [[ $TITLE == *"alerting"* || $TITLE == *"provider"* || $TITLE == *"alert"* ]]; then
+            gh issue edit "$NUMBER" --add-label "area/alerting"
+          fi
+          if [[ $TITLE == *"(ui)"* || $TITLE == *"ui:"* ]]; then
+            gh issue edit "$NUMBER" --add-label "area/ui"
+          fi
+          if [[ $TITLE == *"storage"* || $TITLE == *"postgres"* || $TITLE == *"sqlite"* ]]; then
+            gh issue edit "$NUMBER" --add-label "area/storage"
+          fi
+          if [[ $TITLE == *"security"* || $TITLE == *"oidc"* || $TITLE == *"oauth2"* ]]; then
+            gh issue edit "$NUMBER" --add-label "area/security"
+          fi
+          if [[ $TITLE == *"metric"* || $TITLE == *"prometheus"* ]]; then
+            gh issue edit "$NUMBER" --add-label "area/metrics"
+          fi

.github/workflows/publish-custom.yml

@@ -0,0 +1,49 @@
+name: publish-custom
+run-name: "${{ inputs.tag }}"
+on:
+  workflow_dispatch:
+    inputs:
+      tag:
+        description: Custom tag to publish
+      platforms:
+        description: Platforms to publish to (comma separated list)
+        default: linux/amd64
+        type: choice
+        options:
+          - linux/amd64
+          - linux/arm/v7
+          - linux/arm64
+
+jobs:
+  publish-custom:
+    runs-on: ubuntu-latest
+    timeout-minutes: 60
+    steps:
+      - uses: actions/checkout@v5
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+      - name: Get image repository
+        run: echo GHCR_IMAGE_REPOSITORY=$(echo ghcr.io/${{ github.actor }}/${{ github.event.repository.name }} | tr '[:upper:]' '[:lower:]') >> $GITHUB_ENV
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.GHCR_IMAGE_REPOSITORY }}
+          tags: |
+            type=raw,value=${{ inputs.tag }}
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v6
+        with:
+          platforms: ${{ inputs.platforms }}
+          pull: true
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}

.github/workflows/publish-experimental.yml

@@ -3,9 +3,9 @@ on: [workflow_dispatch]
 jobs:
   publish-experimental:
     runs-on: ubuntu-latest
-    timeout-minutes: 20
+    timeout-minutes: 60
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v3
       - name: Set up Docker Buildx
@@ -17,10 +17,18 @@ jobs:
         with:
           username: ${{ secrets.DOCKER_USERNAME }}
           password: ${{ secrets.DOCKER_PASSWORD }}
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.IMAGE_REPOSITORY }}
+          tags: |
+            type=raw,value=experimental
       - name: Build and push Docker image
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           platforms: linux/amd64
           pull: true
           push: true
-          tags: ${{ env.IMAGE_REPOSITORY }}:experimental
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}

.github/workflows/publish-latest-to-ghcr.yml

@@ -1,38 +0,0 @@
-name: publish-latest-to-ghcr
-on:
-  workflow_run:
-    workflows: [test]
-    branches: [master]
-    types: [completed]
-concurrency:
-  group: ${{ github.event.workflow_run.head_repository.full_name }}::${{ github.event.workflow_run.head_branch }}::${{ github.workflow }}
-  cancel-in-progress: true
-jobs:
-  publish-latest-to-ghcr:
-    runs-on: ubuntu-latest
-    if: ${{ (github.event.workflow_run.conclusion == 'success') && (github.event.workflow_run.head_repository.full_name == github.repository) }}
-    permissions:
-      contents: read
-      packages: write
-    timeout-minutes: 60
-    steps:
-      - uses: actions/checkout@v4
-      - name: Set up QEMU
-        uses: docker/setup-qemu-action@v3
-      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
-      - name: Get image repository
-        run: echo IMAGE_REPOSITORY=$(echo ghcr.io/${{ github.actor }}/${{ github.event.repository.name }} | tr '[:upper:]' '[:lower:]') >> $GITHUB_ENV
-      - name: Login to Registry
-        uses: docker/login-action@v3
-        with:
-          registry: ghcr.io
-          username: ${{ github.actor }}
-          password: ${{ secrets.GITHUB_TOKEN }}
-      - name: Build and push Docker image
-        uses: docker/build-push-action@v5
-        with:
-          platforms: linux/amd64,linux/arm/v6,linux/arm/v7,linux/arm64
-          pull: true
-          push: true
-          tags: ${{ env.IMAGE_REPOSITORY }}:latest

.github/workflows/publish-latest.yml

@@ -11,24 +11,42 @@ jobs:
   publish-latest:
     runs-on: ubuntu-latest
     if: ${{ (github.event.workflow_run.conclusion == 'success') && (github.event.workflow_run.head_repository.full_name == github.repository) }}
-    timeout-minutes: 60
+    timeout-minutes: 240
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v3
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
       - name: Get image repository
-        run: echo IMAGE_REPOSITORY=$(echo ${{ secrets.DOCKER_USERNAME }}/${{ github.event.repository.name }} | tr '[:upper:]' '[:lower:]') >> $GITHUB_ENV
+        run: |
+          echo DOCKER_IMAGE_REPOSITORY=$(echo ${{ secrets.DOCKER_USERNAME }}/${{ github.event.repository.name }} | tr '[:upper:]' '[:lower:]') >> $GITHUB_ENV
+          echo GHCR_IMAGE_REPOSITORY=$(echo ghcr.io/${{ github.actor }}/${{ github.event.repository.name }} | tr '[:upper:]' '[:lower:]') >> $GITHUB_ENV
       - name: Login to Docker Registry
         uses: docker/login-action@v3
         with:
           username: ${{ secrets.DOCKER_USERNAME }}
           password: ${{ secrets.DOCKER_PASSWORD }}
-      - name: Build and push Docker image
-        uses: docker/build-push-action@v5
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v3
         with:
-          platforms: linux/amd64,linux/arm/v6,linux/arm/v7,linux/arm64
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: |
+            ${{ env.DOCKER_IMAGE_REPOSITORY }}
+            ${{ env.GHCR_IMAGE_REPOSITORY }}
+          tags: |
+            type=raw,value=latest
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v6
+        with:
+          platforms: linux/amd64,linux/arm/v7,linux/arm64
           pull: true
           push: true
-          tags: ${{ env.IMAGE_REPOSITORY }}:latest
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}

.github/workflows/publish-release-to-ghcr.yml

@@ -1,37 +0,0 @@
-name: publish-release-to-ghcr
-on:
-  release:
-    types: [published]
-jobs:
-  publish-release-to-ghcr:
-    runs-on: ubuntu-latest
-    permissions:
-      contents: read
-      packages: write
-    timeout-minutes: 60
-    steps:
-      - uses: actions/checkout@v4
-      - name: Set up QEMU
-        uses: docker/setup-qemu-action@v3
-      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
-      - name: Get image repository
-        run: echo IMAGE_REPOSITORY=$(echo ghcr.io/${{ github.actor }}/${{ github.event.repository.name }} | tr '[:upper:]' '[:lower:]') >> $GITHUB_ENV
-      - name: Get the release
-        run: echo RELEASE=${GITHUB_REF/refs\/tags\//} >> $GITHUB_ENV
-      - name: Login to Registry
-        uses: docker/login-action@v3
-        with:
-          registry: ghcr.io
-          username: ${{ github.actor }}
-          password: ${{ secrets.GITHUB_TOKEN }}
-      - name: Build and push Docker image
-        uses: docker/build-push-action@v5
-        with:
-          platforms: linux/amd64,linux/arm/v6,linux/arm/v7,linux/arm64
-          pull: true
-          push: true
-          tags: |
-            ${{ env.IMAGE_REPOSITORY }}:${{ env.RELEASE }}
-            ${{ env.IMAGE_REPOSITORY }}:stable
-            ${{ env.IMAGE_REPOSITORY }}:latest

.github/workflows/publish-release.yml

@@ -6,15 +6,17 @@ jobs:
   publish-release:
     name: publish-release
     runs-on: ubuntu-latest
-    timeout-minutes: 60
+    timeout-minutes: 240
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v3
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
       - name: Get image repository
-        run: echo IMAGE_REPOSITORY=$(echo ${{ secrets.DOCKER_USERNAME }}/${{ github.event.repository.name }} | tr '[:upper:]' '[:lower:]') >> $GITHUB_ENV
+        run: |
+          echo DOCKER_IMAGE_REPOSITORY=$(echo ${{ secrets.DOCKER_USERNAME }}/${{ github.event.repository.name }} | tr '[:upper:]' '[:lower:]') >> $GITHUB_ENV
+          echo GHCR_IMAGE_REPOSITORY=$(echo ghcr.io/${{ github.actor }}/${{ github.event.repository.name }} | tr '[:upper:]' '[:lower:]') >> $GITHUB_ENV
       - name: Get the release
         run: echo RELEASE=${GITHUB_REF/refs\/tags\//} >> $GITHUB_ENV
       - name: Login to Docker Registry
@@ -22,13 +24,28 @@ jobs:
         with:
           username: ${{ secrets.DOCKER_USERNAME }}
           password: ${{ secrets.DOCKER_PASSWORD }}
-      - name: Build and push Docker image
-        uses: docker/build-push-action@v5
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v3
         with:
-          platforms: linux/amd64,linux/arm/v6,linux/arm/v7,linux/arm64
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: |
+            ${{ env.DOCKER_IMAGE_REPOSITORY }}
+            ${{ env.GHCR_IMAGE_REPOSITORY }}
+          tags: |
+            type=raw,value=${{ env.RELEASE }}
+            type=raw,value=stable
+            type=raw,value=latest
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v6
+        with:
+          platforms: linux/amd64,linux/arm/v7,linux/arm64
           pull: true
           push: true
-          tags: |
-            ${{ env.IMAGE_REPOSITORY }}:${{ env.RELEASE }}
-            ${{ env.IMAGE_REPOSITORY }}:stable
-            ${{ env.IMAGE_REPOSITORY }}:latest
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}

.github/workflows/regenerate-static-assets.yml

@@ -0,0 +1,107 @@
+name: regenerate-static-assets
+on:
+  issue_comment:
+    types: [created]
+
+jobs:
+  check-command:
+    runs-on: ubuntu-latest
+    if: ${{ github.event.issue.pull_request }}
+    permissions:
+      pull-requests: write # required for adding reactions to command comments on PRs
+      checks: read # required to check if all ci checks have passed
+    outputs:
+      continue: ${{ steps.command.outputs.continue }}
+    steps:
+      - name: Check command trigger
+        id: command
+        uses: github/command@v2
+        with:
+          command: "/regenerate-static-assets"
+          permissions: "write,admin" # The allowed permission levels to invoke this command
+          allow_forks: true
+          allow_drafts: true
+          skip_ci: true
+          skip_completing: true
+
+  regenerate-static-assets:
+    runs-on: ubuntu-latest
+    needs: check-command
+    if: ${{ needs.check-command.outputs.continue == 'true' }}
+    permissions:
+      contents: write
+    outputs:
+      status: ${{ steps.commit.outputs.status }}
+    steps:
+      - name: Get PR branch
+        id: pr
+        uses: actions/github-script@v8
+        with:
+          script: |
+            const pr = await github.rest.pulls.get({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              pull_number: context.issue.number
+            });
+            core.setOutput('ref', pr.data.head.ref);
+            core.setOutput('repo', pr.data.head.repo.full_name);
+      - name: Checkout PR branch
+        uses: actions/checkout@v6
+        with:
+          repository: ${{ steps.pr.outputs.repo }}
+          ref: ${{ steps.pr.outputs.ref }}
+      - name: Regenerate static assets
+        run: |
+          make frontend-install-dependencies
+          make frontend-build
+      - name: Commit and push changes
+        id: commit
+        run: |
+          echo "Checking for changes..."
+          if git diff --quiet; then
+            echo "No changes detected."
+            echo "status=no_changes" >> $GITHUB_OUTPUT
+            exit 0
+          fi
+          git config --global user.name "github-actions[bot]"
+          git config --global user.email "github-actions[bot]@users.noreply.github.com"
+          echo "Changes detected. Committing and pushing..."
+          git add . 
+          git commit -m "chore(ui): Regenerate static assets"
+          git push origin ${{ steps.pr.outputs.ref }}
+          echo "status=success" >> $GITHUB_OUTPUT
+
+  create-response-comment:
+    runs-on: ubuntu-latest
+    needs: [check-command, regenerate-static-assets]
+    if: ${{ !cancelled() && needs.check-command.outputs.continue == 'true' }}
+    permissions:
+      pull-requests: write
+    steps:
+      - name: Create response comment
+        uses: actions/github-script@v8
+        with:
+          script: |
+            const status = '${{ needs.regenerate-static-assets.outputs.status }}';
+            let reaction = '';
+            if (status === 'success') {
+              reaction = 'hooray';
+            } else if (status === 'no_changes') {
+              reaction = '+1';
+            } else {
+              reaction = '-1';
+              var workflowUrl = `${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}`;
+              var body = '⚠️ There was an issue regenerating static assets. Please check the [workflow run logs](' + workflowUrl + ') for more details.';
+              await github.rest.issues.createComment({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                issue_number: context.issue.number,
+                body: body
+              });
+            }
+            await github.rest.reactions.createForIssueComment({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              comment_id: context.payload.comment.id,
+              content: reaction
+            });

.github/workflows/test-ui.yml

@@ -0,0 +1,18 @@
+name: test-ui
+on:
+  pull_request:
+    paths:
+      - 'web/**'
+  push:
+    branches:
+      - master
+    paths:
+      - 'web/**'
+jobs:
+  test-ui:
+    runs-on: ubuntu-latest
+    timeout-minutes: 30
+    steps:
+      - uses: actions/checkout@v5
+      - run: make frontend-install-dependencies
+      - run: make frontend-build

.github/workflows/test.yml

@@ -14,12 +14,12 @@ on:
 jobs:
   test:
     runs-on: ubuntu-latest
-    timeout-minutes: 10
+    timeout-minutes: 30
     steps:
-      - uses: actions/setup-go@v5
+      - uses: actions/setup-go@v6
         with:
-          go-version: 1.21
-      - uses: actions/checkout@v4
+          go-version: 1.24.4
+      - uses: actions/checkout@v5
       - name: Build binary to make sure it works
         run: go build
       - name: Test
@@ -28,7 +28,7 @@ jobs:
         # was configured by the "Set up Go" step (otherwise, it'd use sudo's "go" executable)
         run: sudo env "PATH=$PATH" "GOROOT=$GOROOT" go test ./... -race -coverprofile=coverage.txt -covermode=atomic
       - name: Codecov
-        uses: codecov/codecov-action@v4.4.0
+        uses: codecov/codecov-action@v5.5.2
         with:
           files: ./coverage.txt
           token: ${{ secrets.CODECOV_TOKEN }}

.gitignore

@@ -17,4 +17,5 @@ node_modules
 *.db-shm
 *.db-wal
 gatus
-config/config.yml
+config/config.yml
+config.yaml

Dockerfile

@@ -1,9 +1,9 @@
 # Build the go application into a binary
-FROM golang:alpine as builder
+FROM golang:alpine AS builder
 RUN apk --update add ca-certificates
 WORKDIR /app
 COPY . ./
-RUN go mod tidy
+RUN go mod tidy -diff
 RUN CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o gatus .
 
 # Run Tests inside docker image if you don't have a configured go environment
@@ -15,6 +15,8 @@ FROM scratch
 COPY --from=builder /app/gatus .
 COPY --from=builder /app/config.yaml ./config/config.yaml
 COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt
-ENV PORT=8080
+ENV GATUS_CONFIG_PATH=""
+ENV GATUS_LOG_LEVEL="INFO"
+ENV PORT="8080"
 EXPOSE ${PORT}
 ENTRYPOINT ["/gatus"]

Makefile

@@ -6,7 +6,11 @@ install:
 
 .PHONY: run
 run:
-	GATUS_CONFIG_PATH=./config.yaml ./$(BINARY)
+	ENVIRONMENT=dev GATUS_CONFIG_PATH=./config.yaml go run main.go
+
+.PHONY: run-binary
+run-binary:
+	ENVIRONMENT=dev GATUS_CONFIG_PATH=./config.yaml ./$(BINARY)
 
 .PHONY: clean
 clean:
@@ -34,6 +38,9 @@ docker-build-and-run: docker-build docker-run
 # Front end #
 #############
 
+frontend-install-dependencies:
+	npm --prefix web/app install
+
 frontend-build:
 	npm --prefix web/app run build
 

alerting/alert/alert.go

@@ -6,14 +6,20 @@ import (
 	"errors"
 	"strconv"
 	"strings"
+	"time"
+
+	"github.com/TwiN/logr"
+	"gopkg.in/yaml.v3"
 )
 
 var (
 	// ErrAlertWithInvalidDescription is the error with which Gatus will panic if an alert has an invalid character
 	ErrAlertWithInvalidDescription = errors.New("alert description must not have \" or \\")
+
+	ErrAlertWithInvalidMinimumReminderInterval = errors.New("minimum-reminder-interval must be either omitted or be at least 5m")
 )
 
-// Alert is a endpoint.Endpoint's alert configuration
+// Alert is endpoint.Endpoint's alert configuration
 type Alert struct {
 	// Type of alert (required)
 	Type Type `yaml:"type"`
@@ -32,17 +38,24 @@ type Alert struct {
 	// SuccessThreshold defines how many successful executions must happen in a row before an ongoing incident is marked as resolved
 	SuccessThreshold int `yaml:"success-threshold"`
 
+	// MinimumReminderInterval is the interval between reminders
+	MinimumReminderInterval time.Duration `yaml:"minimum-reminder-interval,omitempty"`
+
 	// Description of the alert. Will be included in the alert sent.
 	//
 	// This is a pointer, because it is populated by YAML and we need to know whether it was explicitly set to a value
 	// or not for provider.ParseWithDefaultAlert to work.
-	Description *string `yaml:"description"`
+	Description *string `yaml:"description,omitempty"`
 
 	// SendOnResolved defines whether to send a second notification when the issue has been resolved
 	//
 	// This is a pointer, because it is populated by YAML and we need to know whether it was explicitly set to a value
 	// or not for provider.ParseWithDefaultAlert to work. Use Alert.IsSendingOnResolved() for a non-pointer
-	SendOnResolved *bool `yaml:"send-on-resolved"`
+	SendOnResolved *bool `yaml:"send-on-resolved,omitempty"`
+
+	// ProviderOverride is an optional field that can be used to override the provider's configuration
+	// It is freeform so that it can be used for any provider-specific configuration.
+	ProviderOverride map[string]any `yaml:"provider-override,omitempty"`
 
 	// ResolveKey is an optional field that is used by some providers (i.e. PagerDuty's dedup_key) to resolve
 	// ongoing/triggered incidents
@@ -67,6 +80,9 @@ func (alert *Alert) ValidateAndSetDefaults() error {
 	if alert.SuccessThreshold <= 0 {
 		alert.SuccessThreshold = 2
 	}
+	if alert.MinimumReminderInterval != 0 && alert.MinimumReminderInterval < 5*time.Minute {
+		return ErrAlertWithInvalidMinimumReminderInterval
+	}
 	if strings.ContainsAny(alert.GetDescription(), "\"\\") {
 		return ErrAlertWithInvalidDescription
 	}
@@ -111,3 +127,11 @@ func (alert *Alert) Checksum() string {
 	)
 	return hex.EncodeToString(hash.Sum(nil))
 }
+
+func (alert *Alert) ProviderOverrideAsBytes() []byte {
+	yamlBytes, err := yaml.Marshal(alert.ProviderOverride)
+	if err != nil {
+		logr.Warnf("[alert.ProviderOverrideAsBytes] Failed to marshal alert override of type=%s as bytes: %v", alert.Type, err)
+	}
+	return yamlBytes
+}

alerting/alert/alert_test.go

@@ -3,6 +3,7 @@ package alert
 import (
 	"errors"
 	"testing"
+	"time"
 )
 
 func TestAlert_ValidateAndSetDefaults(t *testing.T) {
@@ -36,6 +37,61 @@ func TestAlert_ValidateAndSetDefaults(t *testing.T) {
 			expectedFailureThreshold: 10,
 			expectedSuccessThreshold: 5,
 		},
+		{
+			name: "valid-minimum-reminder-interval-0",
+			alert: Alert{
+				MinimumReminderInterval: 0,
+				FailureThreshold:        10,
+				SuccessThreshold:        5,
+			},
+			expectedError:            nil,
+			expectedFailureThreshold: 10,
+			expectedSuccessThreshold: 5,
+		},
+		{
+			name: "valid-minimum-reminder-interval-5m",
+			alert: Alert{
+				MinimumReminderInterval: 5 * time.Minute,
+				FailureThreshold:        10,
+				SuccessThreshold:        5,
+			},
+			expectedError:            nil,
+			expectedFailureThreshold: 10,
+			expectedSuccessThreshold: 5,
+		},
+		{
+			name: "valid-minimum-reminder-interval-10m",
+			alert: Alert{
+				MinimumReminderInterval: 10 * time.Minute,
+				FailureThreshold:        10,
+				SuccessThreshold:        5,
+			},
+			expectedError:            nil,
+			expectedFailureThreshold: 10,
+			expectedSuccessThreshold: 5,
+		},
+		{
+			name: "invalid-minimum-reminder-interval-1m",
+			alert: Alert{
+				MinimumReminderInterval: 1 * time.Minute,
+				FailureThreshold:        10,
+				SuccessThreshold:        5,
+			},
+			expectedError:            ErrAlertWithInvalidMinimumReminderInterval,
+			expectedFailureThreshold: 10,
+			expectedSuccessThreshold: 5,
+		},
+		{
+			name: "invalid-minimum-reminder-interval-1s",
+			alert: Alert{
+				MinimumReminderInterval: 1 * time.Second,
+				FailureThreshold:        10,
+				SuccessThreshold:        5,
+			},
+			expectedError:            ErrAlertWithInvalidMinimumReminderInterval,
+			expectedFailureThreshold: 10,
+			expectedSuccessThreshold: 5,
+		},
 	}
 	for _, scenario := range scenarios {
 		t.Run(scenario.name, func(t *testing.T) {

alerting/alert/type.go

@@ -8,9 +8,15 @@ const (
 	// TypeAWSSES is the Type for the awsses alerting provider
 	TypeAWSSES Type = "aws-ses"
 
+	// TypeClickUp is the Type for the clickup alerting provider
+	TypeClickUp Type = "clickup"
+
 	// TypeCustom is the Type for the custom alerting provider
 	TypeCustom Type = "custom"
 
+	// TypeDatadog is the Type for the datadog alerting provider
+	TypeDatadog Type = "datadog"
+
 	// TypeDiscord is the Type for the discord alerting provider
 	TypeDiscord Type = "discord"
 
@@ -23,14 +29,29 @@ const (
 	// TypeGitLab is the Type for the gitlab alerting provider
 	TypeGitLab Type = "gitlab"
 
+	// TypeGitea is the Type for the gitea alerting provider
+	TypeGitea Type = "gitea"
+
 	// TypeGoogleChat is the Type for the googlechat alerting provider
 	TypeGoogleChat Type = "googlechat"
 
 	// TypeGotify is the Type for the gotify alerting provider
 	TypeGotify Type = "gotify"
 
-	// TypeJetBrainsSpace is the Type for the jetbrains alerting provider
-	TypeJetBrainsSpace Type = "jetbrainsspace"
+	// TypeHomeAssistant is the Type for the homeassistant alerting provider
+	TypeHomeAssistant Type = "homeassistant"
+
+	// TypeIFTTT is the Type for the ifttt alerting provider
+	TypeIFTTT Type = "ifttt"
+
+	// TypeIlert is the Type for the ilert alerting provider
+	TypeIlert Type = "ilert"
+
+	// TypeIncidentIO is the Type for the incident-io alerting provider
+	TypeIncidentIO Type = "incident-io"
+
+	// TypeLine is the Type for the line alerting provider
+	TypeLine Type = "line"
 
 	// TypeMatrix is the Type for the matrix alerting provider
 	TypeMatrix Type = "matrix"
@@ -41,6 +62,12 @@ const (
 	// TypeMessagebird is the Type for the messagebird alerting provider
 	TypeMessagebird Type = "messagebird"
 
+	// TypeNewRelic is the Type for the newrelic alerting provider
+	TypeNewRelic Type = "newrelic"
+
+	// TypeN8N is the Type for the n8n alerting provider
+	TypeN8N Type = "n8n"
+
 	// TypeNtfy is the Type for the ntfy alerting provider
 	TypeNtfy Type = "ntfy"
 
@@ -50,18 +77,54 @@ const (
 	// TypePagerDuty is the Type for the pagerduty alerting provider
 	TypePagerDuty Type = "pagerduty"
 
+	// TypePlivo is the Type for the plivo alerting provider
+	TypePlivo Type = "plivo"
+
 	// TypePushover is the Type for the pushover alerting provider
 	TypePushover Type = "pushover"
 
+	// TypeRocketChat is the Type for the rocketchat alerting provider
+	TypeRocketChat Type = "rocketchat"
+
+	// TypeSendGrid is the Type for the sendgrid alerting provider
+	TypeSendGrid Type = "sendgrid"
+
+	// TypeSignal is the Type for the signal alerting provider
+	TypeSignal Type = "signal"
+
+	// TypeSIGNL4 is the Type for the signl4 alerting provider
+	TypeSIGNL4 Type = "signl4"
+
 	// TypeSlack is the Type for the slack alerting provider
 	TypeSlack Type = "slack"
 
+	// TypeSplunk is the Type for the splunk alerting provider
+	TypeSplunk Type = "splunk"
+
+	// TypeSquadcast is the Type for the squadcast alerting provider
+	TypeSquadcast Type = "squadcast"
+
 	// TypeTeams is the Type for the teams alerting provider
 	TypeTeams Type = "teams"
 
+	// TypeTeamsWorkflows is the Type for the teams-workflows alerting provider
+	TypeTeamsWorkflows Type = "teams-workflows"
+
 	// TypeTelegram is the Type for the telegram alerting provider
 	TypeTelegram Type = "telegram"
 
 	// TypeTwilio is the Type for the twilio alerting provider
 	TypeTwilio Type = "twilio"
+
+	// TypeVonage is the Type for the vonage alerting provider
+	TypeVonage Type = "vonage"
+
+	// TypeWebex is the Type for the webex alerting provider
+	TypeWebex Type = "webex"
+
+	// TypeZapier is the Type for the zapier alerting provider
+	TypeZapier Type = "zapier"
+
+	// TypeZulip is the Type for the Zulip alerting provider
+	TypeZulip Type = "zulip"
 )

alerting/config.go

@@ -1,32 +1,53 @@
 package alerting
 
 import (
-	"log"
 	"reflect"
 	"strings"
 
 	"github.com/TwiN/gatus/v5/alerting/alert"
 	"github.com/TwiN/gatus/v5/alerting/provider"
 	"github.com/TwiN/gatus/v5/alerting/provider/awsses"
+	"github.com/TwiN/gatus/v5/alerting/provider/clickup"
 	"github.com/TwiN/gatus/v5/alerting/provider/custom"
+	"github.com/TwiN/gatus/v5/alerting/provider/datadog"
 	"github.com/TwiN/gatus/v5/alerting/provider/discord"
 	"github.com/TwiN/gatus/v5/alerting/provider/email"
+	"github.com/TwiN/gatus/v5/alerting/provider/gitea"
 	"github.com/TwiN/gatus/v5/alerting/provider/github"
 	"github.com/TwiN/gatus/v5/alerting/provider/gitlab"
 	"github.com/TwiN/gatus/v5/alerting/provider/googlechat"
 	"github.com/TwiN/gatus/v5/alerting/provider/gotify"
-	"github.com/TwiN/gatus/v5/alerting/provider/jetbrainsspace"
+	"github.com/TwiN/gatus/v5/alerting/provider/homeassistant"
+	"github.com/TwiN/gatus/v5/alerting/provider/ifttt"
+	"github.com/TwiN/gatus/v5/alerting/provider/ilert"
+	"github.com/TwiN/gatus/v5/alerting/provider/incidentio"
+	"github.com/TwiN/gatus/v5/alerting/provider/line"
 	"github.com/TwiN/gatus/v5/alerting/provider/matrix"
 	"github.com/TwiN/gatus/v5/alerting/provider/mattermost"
 	"github.com/TwiN/gatus/v5/alerting/provider/messagebird"
+	"github.com/TwiN/gatus/v5/alerting/provider/n8n"
+	"github.com/TwiN/gatus/v5/alerting/provider/newrelic"
 	"github.com/TwiN/gatus/v5/alerting/provider/ntfy"
 	"github.com/TwiN/gatus/v5/alerting/provider/opsgenie"
 	"github.com/TwiN/gatus/v5/alerting/provider/pagerduty"
+	"github.com/TwiN/gatus/v5/alerting/provider/plivo"
 	"github.com/TwiN/gatus/v5/alerting/provider/pushover"
+	"github.com/TwiN/gatus/v5/alerting/provider/rocketchat"
+	"github.com/TwiN/gatus/v5/alerting/provider/sendgrid"
+	"github.com/TwiN/gatus/v5/alerting/provider/signal"
+	"github.com/TwiN/gatus/v5/alerting/provider/signl4"
 	"github.com/TwiN/gatus/v5/alerting/provider/slack"
+	"github.com/TwiN/gatus/v5/alerting/provider/splunk"
+	"github.com/TwiN/gatus/v5/alerting/provider/squadcast"
 	"github.com/TwiN/gatus/v5/alerting/provider/teams"
+	"github.com/TwiN/gatus/v5/alerting/provider/teamsworkflows"
 	"github.com/TwiN/gatus/v5/alerting/provider/telegram"
 	"github.com/TwiN/gatus/v5/alerting/provider/twilio"
+	"github.com/TwiN/gatus/v5/alerting/provider/vonage"
+	"github.com/TwiN/gatus/v5/alerting/provider/webex"
+	"github.com/TwiN/gatus/v5/alerting/provider/zapier"
+	"github.com/TwiN/gatus/v5/alerting/provider/zulip"
+	"github.com/TwiN/logr"
 )
 
 // Config is the configuration for alerting providers
@@ -34,9 +55,15 @@ type Config struct {
 	// AWSSimpleEmailService is the configuration for the aws-ses alerting provider
 	AWSSimpleEmailService *awsses.AlertProvider `yaml:"aws-ses,omitempty"`
 
+	// ClickUp is the configuration for the clickup alerting provider
+	ClickUp *clickup.AlertProvider `yaml:"clickup,omitempty"`
+
 	// Custom is the configuration for the custom alerting provider
 	Custom *custom.AlertProvider `yaml:"custom,omitempty"`
 
+	// Datadog is the configuration for the datadog alerting provider
+	Datadog *datadog.AlertProvider `yaml:"datadog,omitempty"`
+
 	// Discord is the configuration for the discord alerting provider
 	Discord *discord.AlertProvider `yaml:"discord,omitempty"`
 
@@ -49,14 +76,29 @@ type Config struct {
 	// GitLab is the configuration for the gitlab alerting provider
 	GitLab *gitlab.AlertProvider `yaml:"gitlab,omitempty"`
 
+	// Gitea is the configuration for the gitea alerting provider
+	Gitea *gitea.AlertProvider `yaml:"gitea,omitempty"`
+
 	// GoogleChat is the configuration for the googlechat alerting provider
 	GoogleChat *googlechat.AlertProvider `yaml:"googlechat,omitempty"`
 
 	// Gotify is the configuration for the gotify alerting provider
 	Gotify *gotify.AlertProvider `yaml:"gotify,omitempty"`
 
-	// JetBrainsSpace is the configuration for the jetbrains space alerting provider
-	JetBrainsSpace *jetbrainsspace.AlertProvider `yaml:"jetbrainsspace,omitempty"`
+	// HomeAssistant is the configuration for the homeassistant alerting provider
+	HomeAssistant *homeassistant.AlertProvider `yaml:"homeassistant,omitempty"`
+
+	// IFTTT is the configuration for the ifttt alerting provider
+	IFTTT *ifttt.AlertProvider `yaml:"ifttt,omitempty"`
+
+	// Ilert is the configuration for the ilert alerting provider
+	Ilert *ilert.AlertProvider `yaml:"ilert,omitempty"`
+
+	// IncidentIO is the configuration for the incident-io alerting provider
+	IncidentIO *incidentio.AlertProvider `yaml:"incident-io,omitempty"`
+
+	// Line is the configuration for the line alerting provider
+	Line *line.AlertProvider `yaml:"line,omitempty"`
 
 	// Matrix is the configuration for the matrix alerting provider
 	Matrix *matrix.AlertProvider `yaml:"matrix,omitempty"`
@@ -67,6 +109,12 @@ type Config struct {
 	// Messagebird is the configuration for the messagebird alerting provider
 	Messagebird *messagebird.AlertProvider `yaml:"messagebird,omitempty"`
 
+	// NewRelic is the configuration for the newrelic alerting provider
+	NewRelic *newrelic.AlertProvider `yaml:"newrelic,omitempty"`
+
+	// N8N is the configuration for the n8n alerting provider
+	N8N *n8n.AlertProvider `yaml:"n8n,omitempty"`
+
 	// Ntfy is the configuration for the ntfy alerting provider
 	Ntfy *ntfy.AlertProvider `yaml:"ntfy,omitempty"`
 
@@ -76,20 +124,56 @@ type Config struct {
 	// PagerDuty is the configuration for the pagerduty alerting provider
 	PagerDuty *pagerduty.AlertProvider `yaml:"pagerduty,omitempty"`
 
+	// Plivo is the configuration for the plivo alerting provider
+	Plivo *plivo.AlertProvider `yaml:"plivo,omitempty"`
+
 	// Pushover is the configuration for the pushover alerting provider
 	Pushover *pushover.AlertProvider `yaml:"pushover,omitempty"`
 
+	// RocketChat is the configuration for the rocketchat alerting provider
+	RocketChat *rocketchat.AlertProvider `yaml:"rocketchat,omitempty"`
+
+	// SendGrid is the configuration for the sendgrid alerting provider
+	SendGrid *sendgrid.AlertProvider `yaml:"sendgrid,omitempty"`
+
+	// Signal is the configuration for the signal alerting provider
+	Signal *signal.AlertProvider `yaml:"signal,omitempty"`
+
+	// SIGNL4 is the configuration for the signl4 alerting provider
+	SIGNL4 *signl4.AlertProvider `yaml:"signl4,omitempty"`
+
 	// Slack is the configuration for the slack alerting provider
 	Slack *slack.AlertProvider `yaml:"slack,omitempty"`
 
+	// Splunk is the configuration for the splunk alerting provider
+	Splunk *splunk.AlertProvider `yaml:"splunk,omitempty"`
+
+	// Squadcast is the configuration for the squadcast alerting provider
+	Squadcast *squadcast.AlertProvider `yaml:"squadcast,omitempty"`
+
 	// Teams is the configuration for the teams alerting provider
 	Teams *teams.AlertProvider `yaml:"teams,omitempty"`
 
+	// TeamsWorkflows is the configuration for the teams alerting provider using the new Workflow App Webhook Connector
+	TeamsWorkflows *teamsworkflows.AlertProvider `yaml:"teams-workflows,omitempty"`
+
 	// Telegram is the configuration for the telegram alerting provider
 	Telegram *telegram.AlertProvider `yaml:"telegram,omitempty"`
 
 	// Twilio is the configuration for the twilio alerting provider
 	Twilio *twilio.AlertProvider `yaml:"twilio,omitempty"`
+
+	// Vonage is the configuration for the vonage alerting provider
+	Vonage *vonage.AlertProvider `yaml:"vonage,omitempty"`
+
+	// Webex is the configuration for the webex alerting provider
+	Webex *webex.AlertProvider `yaml:"webex,omitempty"`
+
+	// Zapier is the configuration for the zapier alerting provider
+	Zapier *zapier.AlertProvider `yaml:"zapier,omitempty"`
+
+	// Zulip is the configuration for the zulip alerting provider
+	Zulip *zulip.AlertProvider `yaml:"zulip,omitempty"`
 }
 
 // GetAlertingProviderByAlertType returns an provider.AlertProvider by its corresponding alert.Type
@@ -106,7 +190,7 @@ func (config *Config) GetAlertingProviderByAlertType(alertType alert.Type) provi
 			return fieldValue.Interface().(provider.AlertProvider)
 		}
 	}
-	log.Printf("[alerting.GetAlertingProviderByAlertType] No alerting provider found for alert type %s", alertType)
+	logr.Infof("[alerting.GetAlertingProviderByAlertType] No alerting provider found for alert type %s", alertType)
 	return nil
 }
 

alerting/provider/awsses/awsses.go

@@ -1,30 +1,73 @@
 package awsses
 
 import (
+	"context"
+	"errors"
 	"fmt"
 	"strings"
 
 	"github.com/TwiN/gatus/v5/alerting/alert"
 	"github.com/TwiN/gatus/v5/config/endpoint"
-	"github.com/aws/aws-sdk-go/aws"
-	"github.com/aws/aws-sdk-go/aws/awserr"
-	"github.com/aws/aws-sdk-go/aws/credentials"
-	"github.com/aws/aws-sdk-go/aws/session"
-	"github.com/aws/aws-sdk-go/service/ses"
+	"github.com/aws/aws-sdk-go-v2/aws"
+	"github.com/aws/aws-sdk-go-v2/config"
+	"github.com/aws/aws-sdk-go-v2/credentials"
+	"github.com/aws/aws-sdk-go-v2/service/ses"
+	"github.com/aws/aws-sdk-go-v2/service/ses/types"
+	"gopkg.in/yaml.v3"
 )
 
 const (
 	CharSet = "UTF-8"
 )
 
-// AlertProvider is the configuration necessary for sending an alert using AWS Simple Email Service
-type AlertProvider struct {
+var (
+	ErrDuplicateGroupOverride = errors.New("duplicate group override")
+	ErrMissingFromOrToFields  = errors.New("from and to fields are required")
+	ErrInvalidAWSAuthConfig   = errors.New("either both or neither of access-key-id and secret-access-key must be specified")
+)
+
+type Config struct {
 	AccessKeyID     string `yaml:"access-key-id"`
 	SecretAccessKey string `yaml:"secret-access-key"`
 	Region          string `yaml:"region"`
 
 	From string `yaml:"from"`
 	To   string `yaml:"to"`
+}
+
+func (cfg *Config) Validate() error {
+	if len(cfg.From) == 0 || len(cfg.To) == 0 {
+		return ErrMissingFromOrToFields
+	}
+	if !((len(cfg.AccessKeyID) == 0 && len(cfg.SecretAccessKey) == 0) || (len(cfg.AccessKeyID) > 0 && len(cfg.SecretAccessKey) > 0)) {
+		// if both AccessKeyID and SecretAccessKey are specified, we'll use these to authenticate,
+		// otherwise if neither are specified, then we'll fall back on IAM authentication.
+		return ErrInvalidAWSAuthConfig
+	}
+	return nil
+}
+
+func (cfg *Config) Merge(override *Config) {
+	if len(override.AccessKeyID) > 0 {
+		cfg.AccessKeyID = override.AccessKeyID
+	}
+	if len(override.SecretAccessKey) > 0 {
+		cfg.SecretAccessKey = override.SecretAccessKey
+	}
+	if len(override.Region) > 0 {
+		cfg.Region = override.Region
+	}
+	if len(override.From) > 0 {
+		cfg.From = override.From
+	}
+	if len(override.To) > 0 {
+		cfg.To = override.To
+	}
+}
+
+// AlertProvider is the configuration necessary for sending an alert using AWS Simple Email Service
+type AlertProvider struct {
+	DefaultConfig Config `yaml:",inline"`
 
 	// DefaultAlert is the default alert configuration to use for endpoints with an alert of the appropriate type
 	DefaultAlert *alert.Alert `yaml:"default-alert,omitempty"`
@@ -35,80 +78,76 @@ type AlertProvider struct {
 
 // Override is a case under which the default integration is overridden
 type Override struct {
-	Group string `yaml:"group"`
-	To    string `yaml:"to"`
+	Group  string `yaml:"group"`
+	Config `yaml:",inline"`
 }
 
-// IsValid returns whether the provider's configuration is valid
-func (provider *AlertProvider) IsValid() bool {
+// Validate the provider's configuration
+func (provider *AlertProvider) Validate() error {
 	registeredGroups := make(map[string]bool)
 	if provider.Overrides != nil {
 		for _, override := range provider.Overrides {
 			if isAlreadyRegistered := registeredGroups[override.Group]; isAlreadyRegistered || override.Group == "" || len(override.To) == 0 {
-				return false
+				return ErrDuplicateGroupOverride
 			}
 			registeredGroups[override.Group] = true
 		}
 	}
-	// if both AccessKeyID and SecretAccessKey are specified, we'll use these to authenticate,
-	// otherwise if neither are specified, then we'll fall back on IAM authentication.
-	return len(provider.From) > 0 && len(provider.To) > 0 &&
-		((len(provider.AccessKeyID) == 0 && len(provider.SecretAccessKey) == 0) || (len(provider.AccessKeyID) > 0 && len(provider.SecretAccessKey) > 0))
+	return provider.DefaultConfig.Validate()
 }
 
 // Send an alert using the provider
 func (provider *AlertProvider) Send(ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) error {
-	sess, err := provider.createSession()
+	cfg, err := provider.GetConfig(ep.Group, alert)
+	if err != nil {
+		return err
+	}
+	ctx := context.Background()
+	svc, err := provider.createClient(ctx, cfg)
 	if err != nil {
 		return err
 	}
-	svc := ses.New(sess)
 	subject, body := provider.buildMessageSubjectAndBody(ep, alert, result, resolved)
-	emails := strings.Split(provider.getToForGroup(ep.Group), ",")
-
+	emails := strings.Split(cfg.To, ",")
 	input := &ses.SendEmailInput{
-		Destination: &ses.Destination{
-			ToAddresses: aws.StringSlice(emails),
+		Destination: &types.Destination{
+			ToAddresses: emails,
 		},
-		Message: &ses.Message{
-			Body: &ses.Body{
-				Text: &ses.Content{
+		Message: &types.Message{
+			Body: &types.Body{
+				Text: &types.Content{
 					Charset: aws.String(CharSet),
 					Data:    aws.String(body),
 				},
 			},
-			Subject: &ses.Content{
+			Subject: &types.Content{
 				Charset: aws.String(CharSet),
 				Data:    aws.String(subject),
 			},
 		},
-		Source: aws.String(provider.From),
+		Source: aws.String(cfg.From),
 	}
-	_, err = svc.SendEmail(input)
-
-	if err != nil {
-		if aerr, ok := err.(awserr.Error); ok {
-			switch aerr.Code() {
-			case ses.ErrCodeMessageRejected:
-				fmt.Println(ses.ErrCodeMessageRejected, aerr.Error())
-			case ses.ErrCodeMailFromDomainNotVerifiedException:
-				fmt.Println(ses.ErrCodeMailFromDomainNotVerifiedException, aerr.Error())
-			case ses.ErrCodeConfigurationSetDoesNotExistException:
-				fmt.Println(ses.ErrCodeConfigurationSetDoesNotExistException, aerr.Error())
-			default:
-				fmt.Println(aerr.Error())
-			}
-		} else {
-			// Print the error, cast err to awserr.Error to get the Code and
-			// Message from an error.
-			fmt.Println(err.Error())
-		}
-
+	if _, err = svc.SendEmail(ctx, input); err != nil {
 		return err
 	}
 	return nil
 }
 
+func (provider *AlertProvider) createClient(ctx context.Context, cfg *Config) (*ses.Client, error) {
+	var opts []func(*config.LoadOptions) error
+	if len(cfg.Region) > 0 {
+		opts = append(opts, config.WithRegion(cfg.Region))
+	}
+	if len(cfg.AccessKeyID) > 0 && len(cfg.SecretAccessKey) > 0 {
+		opts = append(opts, config.WithCredentialsProvider(credentials.NewStaticCredentialsProvider(cfg.AccessKeyID, cfg.SecretAccessKey, "")))
+	}
+	awsConfig, err := config.LoadDefaultConfig(ctx, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return ses.NewFromConfig(awsConfig), nil
+}
+
 // buildMessageSubjectAndBody builds the message subject and body
 func (provider *AlertProvider) buildMessageSubjectAndBody(ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) (string, string) {
 	var subject, message string
@@ -139,29 +178,38 @@ func (provider *AlertProvider) buildMessageSubjectAndBody(ep *endpoint.Endpoint,
 	return subject, message + description + formattedConditionResults
 }
 
-// getToForGroup returns the appropriate email integration to for a given group
-func (provider *AlertProvider) getToForGroup(group string) string {
-	if provider.Overrides != nil {
-		for _, override := range provider.Overrides {
-			if group == override.Group {
-				return override.To
-			}
-		}
-	}
-	return provider.To
-}
-
 // GetDefaultAlert returns the provider's default alert configuration
 func (provider *AlertProvider) GetDefaultAlert() *alert.Alert {
 	return provider.DefaultAlert
 }
 
-func (provider *AlertProvider) createSession() (*session.Session, error) {
-	config := &aws.Config{
-		Region: aws.String(provider.Region),
+// GetConfig returns the configuration for the provider with the overrides applied
+func (provider *AlertProvider) GetConfig(group string, alert *alert.Alert) (*Config, error) {
+	cfg := provider.DefaultConfig
+	// Handle group overrides
+	if provider.Overrides != nil {
+		for _, override := range provider.Overrides {
+			if group == override.Group {
+				cfg.Merge(&override.Config)
+				break
+			}
+		}
 	}
-	if len(provider.AccessKeyID) > 0 && len(provider.SecretAccessKey) > 0 {
-		config.Credentials = credentials.NewStaticCredentials(provider.AccessKeyID, provider.SecretAccessKey, "")
+	// Handle alert overrides
+	if len(alert.ProviderOverride) != 0 {
+		overrideConfig := Config{}
+		if err := yaml.Unmarshal(alert.ProviderOverrideAsBytes(), &overrideConfig); err != nil {
+			return nil, err
+		}
+		cfg.Merge(&overrideConfig)
 	}
-	return session.NewSession(config)
+	// Validate the configuration
+	err := cfg.Validate()
+	return &cfg, err
+}
+
+// ValidateOverrides validates the alert's provider override and, if present, the group override
+func (provider *AlertProvider) ValidateOverrides(group string, alert *alert.Alert) error {
+	_, err := provider.GetConfig(group, alert)
+	return err
 }

alerting/provider/awsses/awsses_test.go

@@ -7,59 +7,61 @@ import (
 	"github.com/TwiN/gatus/v5/config/endpoint"
 )
 
-func TestAlertDefaultProvider_IsValid(t *testing.T) {
+func TestAlertProvider_Validate(t *testing.T) {
 	invalidProvider := AlertProvider{}
-	if invalidProvider.IsValid() {
+	if err := invalidProvider.Validate(); err == nil {
 		t.Error("provider shouldn't have been valid")
 	}
-	invalidProviderWithOneKey := AlertProvider{From: "from@example.com", To: "to@example.com", AccessKeyID: "1"}
-	if invalidProviderWithOneKey.IsValid() {
+	invalidProviderWithOneKey := AlertProvider{DefaultConfig: Config{From: "from@example.com", To: "to@example.com", AccessKeyID: "1"}}
+	if err := invalidProviderWithOneKey.Validate(); err == nil {
 		t.Error("provider shouldn't have been valid")
 	}
-	validProvider := AlertProvider{From: "from@example.com", To: "to@example.com"}
-	if !validProvider.IsValid() {
+	validProvider := AlertProvider{DefaultConfig: Config{From: "from@example.com", To: "to@example.com"}}
+	if err := validProvider.Validate(); err != nil {
 		t.Error("provider should've been valid")
 	}
-	validProviderWithKeys := AlertProvider{From: "from@example.com", To: "to@example.com", AccessKeyID: "1", SecretAccessKey: "1"}
-	if !validProviderWithKeys.IsValid() {
+	validProviderWithKeys := AlertProvider{DefaultConfig: Config{From: "from@example.com", To: "to@example.com", AccessKeyID: "1", SecretAccessKey: "1"}}
+	if err := validProviderWithKeys.Validate(); err != nil {
 		t.Error("provider should've been valid")
 	}
 }
 
-func TestAlertProvider_IsValidWithOverride(t *testing.T) {
+func TestAlertProvider_ValidateWithOverride(t *testing.T) {
 	providerWithInvalidOverrideGroup := AlertProvider{
 		Overrides: []Override{
 			{
-				To:    "to@example.com",
-				Group: "",
+				Config: Config{To: "to@example.com"},
+				Group:  "",
 			},
 		},
 	}
-	if providerWithInvalidOverrideGroup.IsValid() {
+	if err := providerWithInvalidOverrideGroup.Validate(); err == nil {
 		t.Error("provider Group shouldn't have been valid")
 	}
 	providerWithInvalidOverrideTo := AlertProvider{
 		Overrides: []Override{
 			{
-				To:    "",
-				Group: "group",
+				Config: Config{To: ""},
+				Group:  "group",
 			},
 		},
 	}
-	if providerWithInvalidOverrideTo.IsValid() {
+	if err := providerWithInvalidOverrideTo.Validate(); err == nil {
 		t.Error("provider integration key shouldn't have been valid")
 	}
 	providerWithValidOverride := AlertProvider{
-		From: "from@example.com",
-		To:   "to@example.com",
+		DefaultConfig: Config{
+			From: "from@example.com",
+			To:   "to@example.com",
+		},
 		Overrides: []Override{
 			{
-				To:    "to@example.com",
-				Group: "group",
+				Config: Config{To: "to@example.com"},
+				Group:  "group",
 			},
 		},
 	}
-	if !providerWithValidOverride.IsValid() {
+	if err := providerWithValidOverride.Validate(); err != nil {
 		t.Error("provider should've been valid")
 	}
 }
@@ -124,64 +126,124 @@ func TestAlertProvider_GetDefaultAlert(t *testing.T) {
 	}
 }
 
-func TestAlertProvider_getToForGroup(t *testing.T) {
-	tests := []struct {
+func TestAlertProvider_getConfigWithOverrides(t *testing.T) {
+	scenarios := []struct {
 		Name           string
 		Provider       AlertProvider
 		InputGroup     string
-		ExpectedOutput string
+		InputAlert     alert.Alert
+		ExpectedOutput Config
 	}{
 		{
 			Name: "provider-no-override-specify-no-group-should-default",
 			Provider: AlertProvider{
-				To:        "to@example.com",
+				DefaultConfig: Config{
+					From: "from@example.com",
+					To:   "to@example.com",
+				},
 				Overrides: nil,
 			},
 			InputGroup:     "",
-			ExpectedOutput: "to@example.com",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{From: "from@example.com", To: "to@example.com"},
 		},
 		{
 			Name: "provider-no-override-specify-group-should-default",
 			Provider: AlertProvider{
-				To:        "to@example.com",
+				DefaultConfig: Config{
+					From: "from@example.com",
+					To:   "to@example.com",
+				},
 				Overrides: nil,
 			},
 			InputGroup:     "group",
-			ExpectedOutput: "to@example.com",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{From: "from@example.com", To: "to@example.com"},
 		},
 		{
 			Name: "provider-with-override-specify-no-group-should-default",
 			Provider: AlertProvider{
-				To: "to@example.com",
+				DefaultConfig: Config{
+					From: "from@example.com",
+					To:   "to@example.com",
+				},
 				Overrides: []Override{
 					{
-						Group: "group",
-						To:    "to01@example.com",
+						Group:  "group",
+						Config: Config{To: "groupto@example.com"},
 					},
 				},
 			},
 			InputGroup:     "",
-			ExpectedOutput: "to@example.com",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{From: "from@example.com", To: "to@example.com"},
 		},
 		{
 			Name: "provider-with-override-specify-group-should-override",
 			Provider: AlertProvider{
-				To: "to@example.com",
+				DefaultConfig: Config{
+					From: "from@example.com",
+					To:   "to@example.com",
+				},
 				Overrides: []Override{
 					{
-						Group: "group",
-						To:    "to01@example.com",
+						Group:  "group",
+						Config: Config{To: "groupto@example.com", SecretAccessKey: "wow", AccessKeyID: "noway"},
 					},
 				},
 			},
 			InputGroup:     "group",
-			ExpectedOutput: "to01@example.com",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{From: "from@example.com", To: "groupto@example.com", SecretAccessKey: "wow", AccessKeyID: "noway"},
+		},
+		{
+			Name: "provider-with-override-specify-group-but-alert-override-should-override-group-override",
+			Provider: AlertProvider{
+				DefaultConfig: Config{
+					From: "from@example.com",
+					To:   "to@example.com",
+				},
+				Overrides: []Override{
+					{
+						Group:  "group",
+						Config: Config{From: "from@example.com", To: "groupto@example.com", SecretAccessKey: "sekrit"},
+					},
+				},
+			},
+			InputGroup: "group",
+			InputAlert: alert.Alert{
+				ProviderOverride: map[string]any{
+					"to":            "alertto@example.com",
+					"access-key-id": 123,
+				},
+			},
+			ExpectedOutput: Config{To: "alertto@example.com", From: "from@example.com", AccessKeyID: "123", SecretAccessKey: "sekrit"},
 		},
 	}
-	for _, tt := range tests {
-		t.Run(tt.Name, func(t *testing.T) {
-			if got := tt.Provider.getToForGroup(tt.InputGroup); got != tt.ExpectedOutput {
-				t.Errorf("AlertProvider.getToForGroup() = %v, want %v", got, tt.ExpectedOutput)
+	for _, scenario := range scenarios {
+		t.Run(scenario.Name, func(t *testing.T) {
+			got, err := scenario.Provider.GetConfig(scenario.InputGroup, &scenario.InputAlert)
+			if err != nil {
+				t.Fatalf("unexpected error: %s", err)
+			}
+			if got.From != scenario.ExpectedOutput.From {
+				t.Errorf("expected From to be %s, got %s", scenario.ExpectedOutput.From, got.From)
+			}
+			if got.To != scenario.ExpectedOutput.To {
+				t.Errorf("expected To to be %s, got %s", scenario.ExpectedOutput.To, got.To)
+			}
+			if got.AccessKeyID != scenario.ExpectedOutput.AccessKeyID {
+				t.Errorf("expected AccessKeyID to be %s, got %s", scenario.ExpectedOutput.AccessKeyID, got.AccessKeyID)
+			}
+			if got.SecretAccessKey != scenario.ExpectedOutput.SecretAccessKey {
+				t.Errorf("expected SecretAccessKey to be %s, got %s", scenario.ExpectedOutput.SecretAccessKey, got.SecretAccessKey)
+			}
+			if got.Region != scenario.ExpectedOutput.Region {
+				t.Errorf("expected Region to be %s, got %s", scenario.ExpectedOutput.Region, got.Region)
+			}
+			// Test ValidateOverrides as well, since it really just calls GetConfig
+			if err = scenario.Provider.ValidateOverrides(scenario.InputGroup, &scenario.InputAlert); err != nil {
+				t.Errorf("unexpected error: %s", err)
 			}
 		})
 	}

alerting/provider/clickup/clickup.go

@@ -0,0 +1,285 @@
+package clickup
+
+import (
+	"bytes"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"net/http"
+	"strings"
+
+	"github.com/TwiN/gatus/v5/alerting/alert"
+	"github.com/TwiN/gatus/v5/client"
+	"github.com/TwiN/gatus/v5/config/endpoint"
+	"gopkg.in/yaml.v3"
+)
+
+var (
+	ErrListIDNotSet           = errors.New("list-id not set")
+	ErrTokenNotSet            = errors.New("token not set")
+	ErrDuplicateGroupOverride = errors.New("duplicate group override")
+	ErrInvalidPriority        = errors.New("priority must be one of: urgent, high, normal, low, none")
+)
+
+var priorityMap = map[string]int{
+	"urgent": 1,
+	"high":   2,
+	"normal": 3,
+	"low":    4,
+	"none":   0,
+}
+
+type Config struct {
+	APIURL          string   `yaml:"api-url"`
+	ListID          string   `yaml:"list-id"`
+	Token           string   `yaml:"token"`
+	Assignees       []string `yaml:"assignees"`
+	Status          string   `yaml:"status"`
+	Priority        string   `yaml:"priority"`
+	NotifyAll       *bool    `yaml:"notify-all,omitempty"`
+	Name            string   `yaml:"name,omitempty"`
+	MarkdownContent string   `yaml:"content,omitempty"`
+}
+
+func (cfg *Config) Validate() error {
+	if cfg.ListID == "" {
+		return ErrListIDNotSet
+	}
+	if cfg.Token == "" {
+		return ErrTokenNotSet
+	}
+	if cfg.Priority == "" {
+		cfg.Priority = "normal"
+	}
+	if _, ok := priorityMap[cfg.Priority]; !ok {
+		return ErrInvalidPriority
+	}
+	if cfg.NotifyAll == nil {
+		defaultNotifyAll := true
+		cfg.NotifyAll = &defaultNotifyAll
+	}
+	if cfg.APIURL == "" {
+		cfg.APIURL = "https://api.clickup.com/api/v2"
+	}
+	if cfg.Name == "" {
+		cfg.Name = "Health Check: [ENDPOINT_GROUP]:[ENDPOINT_NAME]"
+	}
+	if cfg.MarkdownContent == "" {
+		cfg.MarkdownContent = "Triggered: [ENDPOINT_GROUP] - [ENDPOINT_NAME] - [ALERT_DESCRIPTION] - [RESULT_ERRORS]"
+	}
+	return nil
+}
+
+func (cfg *Config) Merge(override *Config) {
+	if override.APIURL != "" {
+		cfg.APIURL = override.APIURL
+	}
+	if override.ListID != "" {
+		cfg.ListID = override.ListID
+	}
+	if override.Token != "" {
+		cfg.Token = override.Token
+	}
+	if override.Status != "" {
+		cfg.Status = override.Status
+	}
+	if override.Priority != "" {
+		cfg.Priority = override.Priority
+	}
+	if override.NotifyAll != nil {
+		cfg.NotifyAll = override.NotifyAll
+	}
+	if len(override.Assignees) > 0 {
+		cfg.Assignees = override.Assignees
+	}
+	if override.Name != "" {
+		cfg.Name = override.Name
+	}
+	if override.MarkdownContent != "" {
+		cfg.MarkdownContent = override.MarkdownContent
+	}
+}
+
+// AlertProvider is the configuration necessary for sending an alert using ClickUp
+type AlertProvider struct {
+	DefaultConfig Config `yaml:",inline"`
+
+	// DefaultAlert is the default alert configuration to use for endpoints with an alert of the appropriate type
+	DefaultAlert *alert.Alert `yaml:"default-alert,omitempty"`
+
+	// Overrides is a list of Override that may be prioritized over the default configuration
+	Overrides []Override `yaml:"overrides,omitempty"`
+}
+
+// Override is a case under which the default configuration is overridden
+type Override struct {
+	Group  string `yaml:"group"`
+	Config `yaml:",inline"`
+}
+
+// Validate the provider's configuration
+func (provider *AlertProvider) Validate() error {
+	registeredGroups := make(map[string]bool)
+	if provider.Overrides != nil {
+		for _, override := range provider.Overrides {
+			if isAlreadyRegistered := registeredGroups[override.Group]; isAlreadyRegistered || override.Group == "" {
+				return ErrDuplicateGroupOverride
+			}
+			registeredGroups[override.Group] = true
+		}
+	}
+	return provider.DefaultConfig.Validate()
+}
+
+func (provider *AlertProvider) Send(ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) error {
+	cfg, err := provider.GetConfig(ep.Group, alert)
+	if err != nil {
+		return err
+	}
+	if resolved {
+		return provider.CloseTask(cfg, ep)
+	}
+	// Replace placeholders
+	name := strings.ReplaceAll(cfg.Name, "[ENDPOINT_GROUP]", ep.Group)
+	name = strings.ReplaceAll(name, "[ENDPOINT_NAME]", ep.Name)
+	markdownContent := strings.ReplaceAll(cfg.MarkdownContent, "[ENDPOINT_GROUP]", ep.Group)
+	markdownContent = strings.ReplaceAll(markdownContent, "[ENDPOINT_NAME]", ep.Name)
+	markdownContent = strings.ReplaceAll(markdownContent, "[ALERT_DESCRIPTION]", alert.GetDescription())
+	markdownContent = strings.ReplaceAll(markdownContent, "[RESULT_ERRORS]", strings.Join(result.Errors, ", "))
+	body := map[string]interface{}{
+		"name":             name,
+		"markdown_content": markdownContent,
+		"assignees":        cfg.Assignees,
+		"status":           cfg.Status,
+		"notify_all":       *cfg.NotifyAll,
+	}
+	if cfg.Priority != "none" {
+		body["priority"] = priorityMap[cfg.Priority]
+	}
+	return provider.CreateTask(cfg, body)
+}
+
+func (provider *AlertProvider) CreateTask(cfg *Config, body map[string]interface{}) error {
+	jsonBody, err := json.Marshal(body)
+	if err != nil {
+		return err
+	}
+	createURL := fmt.Sprintf("%s/list/%s/task", cfg.APIURL, cfg.ListID)
+	req, err := http.NewRequest("POST", createURL, bytes.NewBuffer(jsonBody))
+	if err != nil {
+		return err
+	}
+	req.Header.Set("Content-Type", "application/json")
+	req.Header.Set("Authorization", cfg.Token)
+	httpClient := client.GetHTTPClient(nil)
+	resp, err := httpClient.Do(req)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+	if resp.StatusCode >= 400 {
+		return fmt.Errorf("failed to create task, status: %d", resp.StatusCode)
+	}
+	return nil
+}
+
+func (provider *AlertProvider) CloseTask(cfg *Config, ep *endpoint.Endpoint) error {
+	fetchURL := fmt.Sprintf("%s/list/%s/task?include_closed=false", cfg.APIURL, cfg.ListID)
+	req, err := http.NewRequest("GET", fetchURL, nil)
+	if err != nil {
+		return err
+	}
+	req.Header.Set("Authorization", cfg.Token)
+	httpClient := client.GetHTTPClient(nil)
+	resp, err := httpClient.Do(req)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+	if resp.StatusCode >= 400 {
+		return fmt.Errorf("failed to fetch tasks, status: %d", resp.StatusCode)
+	}
+	var fetchResponse struct {
+		Tasks []struct {
+			ID   string `json:"id"`
+			Name string `json:"name"`
+		} `json:"tasks"`
+	}
+	if err := json.NewDecoder(resp.Body).Decode(&fetchResponse); err != nil {
+		return err
+	}
+	var matchingTaskIDs []string
+	for _, task := range fetchResponse.Tasks {
+		if strings.Contains(task.Name, ep.Group) && strings.Contains(task.Name, ep.Name) {
+			matchingTaskIDs = append(matchingTaskIDs, task.ID)
+		}
+	}
+	if len(matchingTaskIDs) == 0 {
+		return fmt.Errorf("no matching tasks found for %s:%s", ep.Group, ep.Name)
+	}
+	for _, taskID := range matchingTaskIDs {
+		if err := provider.UpdateTaskStatus(cfg, taskID, "closed"); err != nil {
+			return fmt.Errorf("failed to close task %s: %v", taskID, err)
+		}
+	}
+	return nil
+}
+
+func (provider *AlertProvider) UpdateTaskStatus(cfg *Config, taskID, status string) error {
+	updateURL := fmt.Sprintf("%s/task/%s", cfg.APIURL, taskID)
+	body := map[string]interface{}{"status": status}
+	jsonBody, err := json.Marshal(body)
+	if err != nil {
+		return err
+	}
+	req, err := http.NewRequest("PUT", updateURL, bytes.NewBuffer(jsonBody))
+	if err != nil {
+		return err
+	}
+	req.Header.Set("Content-Type", "application/json")
+	req.Header.Set("Authorization", cfg.Token)
+	httpClient := client.GetHTTPClient(nil)
+	resp, err := httpClient.Do(req)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+	if resp.StatusCode >= 400 {
+		return fmt.Errorf("failed to update task %s, status: %d", taskID, resp.StatusCode)
+	}
+	return nil
+}
+
+func (provider *AlertProvider) GetDefaultAlert() *alert.Alert {
+	return provider.DefaultAlert
+}
+
+// GetConfig returns the configuration for the provider with the overrides applied
+func (provider *AlertProvider) GetConfig(group string, alert *alert.Alert) (*Config, error) {
+	cfg := provider.DefaultConfig
+	// Handle group overrides
+	if provider.Overrides != nil {
+		for _, override := range provider.Overrides {
+			if group == override.Group {
+				cfg.Merge(&override.Config)
+				break
+			}
+		}
+	}
+	// Handle alert overrides
+	if len(alert.ProviderOverride) != 0 {
+		overrideConfig := Config{}
+		if err := yaml.Unmarshal(alert.ProviderOverrideAsBytes(), &overrideConfig); err != nil {
+			return nil, err
+		}
+		cfg.Merge(&overrideConfig)
+	}
+	// Validate the configuration
+	err := cfg.Validate()
+	return &cfg, err
+}
+
+func (provider *AlertProvider) ValidateOverrides(group string, alert *alert.Alert) error {
+	_, err := provider.GetConfig(group, alert)
+	return err
+}

alerting/provider/clickup/clickup_test.go

@@ -0,0 +1,310 @@
+package clickup
+
+import (
+	"bytes"
+	"encoding/json"
+	"io"
+	"net/http"
+	"testing"
+
+	"github.com/TwiN/gatus/v5/alerting/alert"
+	"github.com/TwiN/gatus/v5/client"
+	"github.com/TwiN/gatus/v5/config/endpoint"
+	"github.com/TwiN/gatus/v5/test"
+)
+
+func TestAlertProvider_Validate(t *testing.T) {
+	invalidProviderNoListID := AlertProvider{DefaultConfig: Config{ListID: "", Token: "test-token"}}
+	if err := invalidProviderNoListID.Validate(); err == nil {
+		t.Error("provider shouldn't have been valid without list-id")
+	}
+	invalidProviderNoToken := AlertProvider{DefaultConfig: Config{ListID: "test-list-id", Token: ""}}
+	if err := invalidProviderNoToken.Validate(); err == nil {
+		t.Error("provider shouldn't have been valid without token")
+	}
+	invalidProviderBadPriority := AlertProvider{DefaultConfig: Config{ListID: "test-list-id", Token: "test-token", Priority: "invalid"}}
+	if err := invalidProviderBadPriority.Validate(); err == nil {
+		t.Error("provider shouldn't have been valid with invalid priority")
+	}
+	validProvider := AlertProvider{DefaultConfig: Config{ListID: "test-list-id", Token: "test-token"}}
+	if err := validProvider.Validate(); err != nil {
+		t.Error("provider should've been valid")
+	}
+	if validProvider.DefaultConfig.Priority != "normal" {
+		t.Errorf("expected default priority to be 'normal', got '%s'", validProvider.DefaultConfig.Priority)
+	}
+	validProviderWithAPIURL := AlertProvider{DefaultConfig: Config{ListID: "test-list-id", Token: "test-token", APIURL: "https://api.clickup.com/api/v2"}}
+	if err := validProviderWithAPIURL.Validate(); err != nil {
+		t.Error("provider should've been valid")
+	}
+	validProviderWithPriority := AlertProvider{DefaultConfig: Config{ListID: "test-list-id", Token: "test-token", Priority: "urgent"}}
+	if err := validProviderWithPriority.Validate(); err != nil {
+		t.Error("provider should've been valid with priority 'urgent'")
+	}
+	validProviderWithNone := AlertProvider{DefaultConfig: Config{ListID: "test-list-id", Token: "test-token", Priority: "none"}}
+	if err := validProviderWithNone.Validate(); err != nil {
+		t.Error("provider should've been valid with priority 'none'")
+	}
+}
+
+func TestAlertProvider_ValidateSetsDefaultAPIURL(t *testing.T) {
+	provider := AlertProvider{DefaultConfig: Config{ListID: "test-list-id", Token: "test-token"}}
+	if err := provider.Validate(); err != nil {
+		t.Error("provider should've been valid")
+	}
+	if provider.DefaultConfig.APIURL != "https://api.clickup.com/api/v2" {
+		t.Errorf("expected APIURL to be set to default, got %s", provider.DefaultConfig.APIURL)
+	}
+}
+
+func TestAlertProvider_Send(t *testing.T) {
+	defer client.InjectHTTPClient(nil)
+	firstDescription := "description-1"
+	secondDescription := "description-2"
+	scenarios := []struct {
+		Name             string
+		Provider         AlertProvider
+		Endpoint         endpoint.Endpoint
+		Alert            alert.Alert
+		Resolved         bool
+		MockRoundTripper test.MockRoundTripper
+		ExpectedError    bool
+	}{
+		{
+			Name:     "triggered",
+			Provider: AlertProvider{DefaultConfig: Config{ListID: "test-list-id", Token: "test-token"}},
+			Endpoint: endpoint.Endpoint{Name: "endpoint-name", Group: "endpoint-group"},
+			Alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved: false,
+			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
+				if r.Method == "POST" && r.URL.Path == "/api/v2/list/test-list-id/task" {
+					return &http.Response{StatusCode: http.StatusOK, Body: http.NoBody}
+				}
+				return &http.Response{StatusCode: http.StatusInternalServerError, Body: http.NoBody}
+			}),
+			ExpectedError: false,
+		},
+		{
+			Name:     "triggered-error",
+			Provider: AlertProvider{DefaultConfig: Config{ListID: "test-list-id", Token: "test-token"}},
+			Endpoint: endpoint.Endpoint{Name: "endpoint-name", Group: "endpoint-group"},
+			Alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved: false,
+			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
+				return &http.Response{StatusCode: http.StatusInternalServerError, Body: http.NoBody}
+			}),
+			ExpectedError: true,
+		},
+		{
+			Name:     "resolved",
+			Provider: AlertProvider{DefaultConfig: Config{ListID: "test-list-id", Token: "test-token"}},
+			Endpoint: endpoint.Endpoint{Name: "endpoint-name", Group: "endpoint-group"},
+			Alert:    alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved: true,
+			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
+				if r.Method == "GET" {
+					// Mock fetch tasks response
+					tasksResponse := map[string]interface{}{
+						"tasks": []map[string]interface{}{
+							{
+								"id":   "task-123",
+								"name": "Health Check: endpoint-group:endpoint-name",
+							},
+						},
+					}
+					body, _ := json.Marshal(tasksResponse)
+					return &http.Response{
+						StatusCode: http.StatusOK,
+						Body:       io.NopCloser(bytes.NewReader(body)),
+					}
+				}
+				if r.Method == "PUT" {
+					// Mock update task status response
+					return &http.Response{StatusCode: http.StatusOK, Body: http.NoBody}
+				}
+				return &http.Response{StatusCode: http.StatusInternalServerError, Body: http.NoBody}
+			}),
+			ExpectedError: false,
+		},
+		{
+			Name:     "resolved-no-matching-tasks",
+			Provider: AlertProvider{DefaultConfig: Config{ListID: "test-list-id", Token: "test-token"}},
+			Endpoint: endpoint.Endpoint{Name: "endpoint-name", Group: "endpoint-group"},
+			Alert:    alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved: true,
+			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
+				if r.Method == "GET" {
+					// Mock fetch tasks response with no matching tasks
+					tasksResponse := map[string]interface{}{
+						"tasks": []map[string]interface{}{},
+					}
+					body, _ := json.Marshal(tasksResponse)
+					return &http.Response{
+						StatusCode: http.StatusOK,
+						Body:       io.NopCloser(bytes.NewReader(body)),
+					}
+				}
+				return &http.Response{StatusCode: http.StatusInternalServerError, Body: http.NoBody}
+			}),
+			ExpectedError: true,
+		},
+		{
+			Name:     "resolved-error-fetching-tasks",
+			Provider: AlertProvider{DefaultConfig: Config{ListID: "test-list-id", Token: "test-token"}},
+			Endpoint: endpoint.Endpoint{Name: "endpoint-name", Group: "endpoint-group"},
+			Alert:    alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved: true,
+			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
+				return &http.Response{StatusCode: http.StatusInternalServerError, Body: http.NoBody}
+			}),
+			ExpectedError: true,
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(scenario.Name, func(t *testing.T) {
+			client.InjectHTTPClient(&http.Client{Transport: scenario.MockRoundTripper})
+			err := scenario.Provider.Send(
+				&scenario.Endpoint,
+				&scenario.Alert,
+				&endpoint.Result{
+					ConditionResults: []*endpoint.ConditionResult{
+						{Condition: "[CONNECTED] == true", Success: scenario.Resolved},
+						{Condition: "[STATUS] == 200", Success: scenario.Resolved},
+					},
+					Errors: []string{"error1", "error2"},
+				},
+				scenario.Resolved,
+			)
+			if scenario.ExpectedError && err == nil {
+				t.Error("expected error, got none")
+			}
+			if !scenario.ExpectedError && err != nil {
+				t.Error("expected no error, got", err.Error())
+			}
+		})
+	}
+}
+
+func TestAlertProvider_GetDefaultAlert(t *testing.T) {
+	if (&AlertProvider{DefaultAlert: &alert.Alert{}}).GetDefaultAlert() == nil {
+		t.Error("expected default alert to be not nil")
+	}
+	if (&AlertProvider{DefaultAlert: nil}).GetDefaultAlert() != nil {
+		t.Error("expected default alert to be nil")
+	}
+}
+
+func TestAlertProvider_GetConfig(t *testing.T) {
+	scenarios := []struct {
+		Name           string
+		Provider       AlertProvider
+		InputGroup     string
+		InputAlert     alert.Alert
+		ExpectedOutput Config
+	}{
+		{
+			Name: "provider-no-override-should-default",
+			Provider: AlertProvider{
+				DefaultConfig: Config{ListID: "test-list-id", Token: "test-token"},
+			},
+			InputGroup:     "",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{ListID: "test-list-id", Token: "test-token", Priority: "normal"},
+		},
+		{
+			Name: "provider-with-alert-override-should-override",
+			Provider: AlertProvider{
+				DefaultConfig: Config{ListID: "test-list-id", Token: "test-token"},
+			},
+			InputGroup: "",
+			InputAlert: alert.Alert{ProviderOverride: map[string]any{
+				"list-id": "override-list-id",
+				"token":   "override-token",
+			}},
+			ExpectedOutput: Config{ListID: "override-list-id", Token: "override-token", Priority: "normal"},
+		},
+		{
+			Name: "provider-with-partial-alert-override-should-merge",
+			Provider: AlertProvider{
+				DefaultConfig: Config{ListID: "test-list-id", Token: "test-token", Status: "in progress"},
+			},
+			InputGroup: "",
+			InputAlert: alert.Alert{ProviderOverride: map[string]any{
+				"status": "closed",
+			}},
+			ExpectedOutput: Config{ListID: "test-list-id", Token: "test-token", Status: "closed", Priority: "normal"},
+		},
+		{
+			Name: "provider-with-assignees-override",
+			Provider: AlertProvider{
+				DefaultConfig: Config{ListID: "test-list-id", Token: "test-token"},
+			},
+			InputGroup: "",
+			InputAlert: alert.Alert{ProviderOverride: map[string]any{
+				"assignees": []string{"user1", "user2"},
+			}},
+			ExpectedOutput: Config{ListID: "test-list-id", Token: "test-token", Assignees: []string{"user1", "user2"}, Priority: "normal"},
+		},
+		{
+			Name: "provider-with-priority-override",
+			Provider: AlertProvider{
+				DefaultConfig: Config{ListID: "test-list-id", Token: "test-token"},
+			},
+			InputGroup: "",
+			InputAlert: alert.Alert{ProviderOverride: map[string]any{
+				"priority": "urgent",
+			}},
+			ExpectedOutput: Config{ListID: "test-list-id", Token: "test-token", Priority: "urgent"},
+		},
+		{
+			Name: "provider-with-none-priority",
+			Provider: AlertProvider{
+				DefaultConfig: Config{ListID: "test-list-id", Token: "test-token"},
+			},
+			InputGroup: "",
+			InputAlert: alert.Alert{ProviderOverride: map[string]any{
+				"priority": "none",
+			}},
+			ExpectedOutput: Config{ListID: "test-list-id", Token: "test-token", Priority: "none"},
+		},
+		{
+			Name: "provider-with-group-override",
+			Provider: AlertProvider{
+				DefaultConfig: Config{ListID: "test-list-id", Token: "test-token"},
+				Overrides: []Override{
+					{Group: "core", Config: Config{ListID: "core-list-id", Priority: "urgent"}},
+				},
+			},
+			InputGroup:     "core",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{ListID: "core-list-id", Token: "test-token", Priority: "urgent"},
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(scenario.Name, func(t *testing.T) {
+			got, err := scenario.Provider.GetConfig(scenario.InputGroup, &scenario.InputAlert)
+			if err != nil {
+				t.Fatalf("unexpected error: %s", err)
+			}
+			if got.ListID != scenario.ExpectedOutput.ListID {
+				t.Errorf("expected ListID to be %s, got %s", scenario.ExpectedOutput.ListID, got.ListID)
+			}
+			if got.Token != scenario.ExpectedOutput.Token {
+				t.Errorf("expected Token to be %s, got %s", scenario.ExpectedOutput.Token, got.Token)
+			}
+			if got.Status != scenario.ExpectedOutput.Status {
+				t.Errorf("expected Status to be %s, got %s", scenario.ExpectedOutput.Status, got.Status)
+			}
+			if got.Priority != scenario.ExpectedOutput.Priority {
+				t.Errorf("expected Priority to be %s, got %s", scenario.ExpectedOutput.Priority, got.Priority)
+			}
+			if len(got.Assignees) != len(scenario.ExpectedOutput.Assignees) {
+				t.Errorf("expected Assignees length to be %d, got %d", len(scenario.ExpectedOutput.Assignees), len(got.Assignees))
+			}
+			// Test ValidateOverrides as well, since it really just calls GetConfig
+			if err = scenario.Provider.ValidateOverrides(scenario.InputGroup, &scenario.InputAlert); err != nil {
+				t.Errorf("unexpected error: %s", err)
+			}
+		})
+	}
+}

alerting/provider/custom/custom.go

@@ -2,6 +2,7 @@ package custom
 
 import (
 	"bytes"
+	"errors"
 	"fmt"
 	"io"
 	"net/http"
@@ -10,11 +11,14 @@ import (
 	"github.com/TwiN/gatus/v5/alerting/alert"
 	"github.com/TwiN/gatus/v5/client"
 	"github.com/TwiN/gatus/v5/config/endpoint"
+	"gopkg.in/yaml.v3"
 )
 
-// AlertProvider is the configuration necessary for sending an alert using a custom HTTP request
-// Technically, all alert providers should be reachable using the custom alert provider
-type AlertProvider struct {
+var (
+	ErrURLNotSet = errors.New("url not set")
+)
+
+type Config struct {
 	URL          string                       `yaml:"url"`
 	Method       string                       `yaml:"method,omitempty"`
 	Body         string                       `yaml:"body,omitempty"`
@@ -23,64 +27,66 @@ type AlertProvider struct {
 
 	// ClientConfig is the configuration of the client used to communicate with the provider's target
 	ClientConfig *client.Config `yaml:"client,omitempty"`
+}
+
+func (cfg *Config) Validate() error {
+	if len(cfg.URL) == 0 {
+		return ErrURLNotSet
+	}
+	return nil
+}
+
+func (cfg *Config) Merge(override *Config) {
+	if override.ClientConfig != nil {
+		cfg.ClientConfig = override.ClientConfig
+	}
+	if len(override.URL) > 0 {
+		cfg.URL = override.URL
+	}
+	if len(override.Method) > 0 {
+		cfg.Method = override.Method
+	}
+	if len(override.Body) > 0 {
+		cfg.Body = override.Body
+	}
+	if len(override.Headers) > 0 {
+		cfg.Headers = override.Headers
+	}
+	if len(override.Placeholders) > 0 {
+		cfg.Placeholders = override.Placeholders
+	}
+}
+
+// AlertProvider is the configuration necessary for sending an alert using a custom HTTP request
+// Technically, all alert providers should be reachable using the custom alert provider
+type AlertProvider struct {
+	DefaultConfig Config `yaml:",inline"`
 
 	// DefaultAlert is the default alert configuration to use for endpoints with an alert of the appropriate type
 	DefaultAlert *alert.Alert `yaml:"default-alert,omitempty"`
+
+	// Overrides is a list of Override that may be prioritized over the default configuration
+	Overrides []Override `yaml:"overrides,omitempty"`
 }
 
-// IsValid returns whether the provider's configuration is valid
-func (provider *AlertProvider) IsValid() bool {
-	if provider.ClientConfig == nil {
-		provider.ClientConfig = client.GetDefaultConfig()
-	}
-	return len(provider.URL) > 0 && provider.ClientConfig != nil
+// Override is a case under which the default integration is overridden
+type Override struct {
+	Group  string `yaml:"group"`
+	Config `yaml:",inline"`
 }
 
-// GetAlertStatePlaceholderValue returns the Placeholder value for ALERT_TRIGGERED_OR_RESOLVED if configured
-func (provider *AlertProvider) GetAlertStatePlaceholderValue(resolved bool) string {
-	status := "TRIGGERED"
-	if resolved {
-		status = "RESOLVED"
-	}
-	if _, ok := provider.Placeholders["ALERT_TRIGGERED_OR_RESOLVED"]; ok {
-		if val, ok := provider.Placeholders["ALERT_TRIGGERED_OR_RESOLVED"][status]; ok {
-			return val
-		}
-	}
-	return status
-}
-
-func (provider *AlertProvider) buildHTTPRequest(ep *endpoint.Endpoint, alert *alert.Alert, resolved bool) *http.Request {
-	body, url, method := provider.Body, provider.URL, provider.Method
-	body = strings.ReplaceAll(body, "[ALERT_DESCRIPTION]", alert.GetDescription())
-	url = strings.ReplaceAll(url, "[ALERT_DESCRIPTION]", alert.GetDescription())
-	body = strings.ReplaceAll(body, "[ENDPOINT_NAME]", ep.Name)
-	url = strings.ReplaceAll(url, "[ENDPOINT_NAME]", ep.Name)
-	body = strings.ReplaceAll(body, "[ENDPOINT_GROUP]", ep.Group)
-	url = strings.ReplaceAll(url, "[ENDPOINT_GROUP]", ep.Group)
-	body = strings.ReplaceAll(body, "[ENDPOINT_URL]", ep.URL)
-	url = strings.ReplaceAll(url, "[ENDPOINT_URL]", ep.URL)
-	if resolved {
-		body = strings.ReplaceAll(body, "[ALERT_TRIGGERED_OR_RESOLVED]", provider.GetAlertStatePlaceholderValue(true))
-		url = strings.ReplaceAll(url, "[ALERT_TRIGGERED_OR_RESOLVED]", provider.GetAlertStatePlaceholderValue(true))
-	} else {
-		body = strings.ReplaceAll(body, "[ALERT_TRIGGERED_OR_RESOLVED]", provider.GetAlertStatePlaceholderValue(false))
-		url = strings.ReplaceAll(url, "[ALERT_TRIGGERED_OR_RESOLVED]", provider.GetAlertStatePlaceholderValue(false))
-	}
-	if len(method) == 0 {
-		method = http.MethodGet
-	}
-	bodyBuffer := bytes.NewBuffer([]byte(body))
-	request, _ := http.NewRequest(method, url, bodyBuffer)
-	for k, v := range provider.Headers {
-		request.Header.Set(k, v)
-	}
-	return request
+// Validate the provider's configuration
+func (provider *AlertProvider) Validate() error {
+	return provider.DefaultConfig.Validate()
 }
 
 func (provider *AlertProvider) Send(ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) error {
-	request := provider.buildHTTPRequest(ep, alert, resolved)
-	response, err := client.GetHTTPClient(provider.ClientConfig).Do(request)
+	cfg, err := provider.GetConfig(ep.Group, alert)
+	if err != nil {
+		return err
+	}
+	request := provider.buildHTTPRequest(cfg, ep, alert, result, resolved)
+	response, err := client.GetHTTPClient(cfg.ClientConfig).Do(request)
 	if err != nil {
 		return err
 	}
@@ -92,7 +98,102 @@ func (provider *AlertProvider) Send(ep *endpoint.Endpoint, alert *alert.Alert, r
 	return err
 }
 
+func (provider *AlertProvider) buildHTTPRequest(cfg *Config, ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) *http.Request {
+	body, url, method := cfg.Body, cfg.URL, cfg.Method
+	body = strings.ReplaceAll(body, "[ALERT_DESCRIPTION]", alert.GetDescription())
+	url = strings.ReplaceAll(url, "[ALERT_DESCRIPTION]", alert.GetDescription())
+	body = strings.ReplaceAll(body, "[ENDPOINT_NAME]", ep.Name)
+	url = strings.ReplaceAll(url, "[ENDPOINT_NAME]", ep.Name)
+	body = strings.ReplaceAll(body, "[ENDPOINT_GROUP]", ep.Group)
+	url = strings.ReplaceAll(url, "[ENDPOINT_GROUP]", ep.Group)
+	body = strings.ReplaceAll(body, "[ENDPOINT_URL]", ep.URL)
+	url = strings.ReplaceAll(url, "[ENDPOINT_URL]", ep.URL)
+	resultErrors := strings.ReplaceAll(strings.Join(result.Errors, ","), "\"", "\\\"")
+	body = strings.ReplaceAll(body, "[RESULT_ERRORS]", resultErrors)
+	url = strings.ReplaceAll(url, "[RESULT_ERRORS]", resultErrors)
+
+	if len(result.ConditionResults) > 0 && strings.Contains(body, "[RESULT_CONDITIONS]") {
+		var formattedConditionResults string
+		for index, conditionResult := range result.ConditionResults {
+			var prefix string
+			if conditionResult.Success {
+				prefix = "✅"
+			} else {
+				prefix = "❌"
+			}
+			formattedConditionResults += fmt.Sprintf("%s - `%s`", prefix, conditionResult.Condition)
+			if index < len(result.ConditionResults)-1 {
+				formattedConditionResults += ", "
+			}
+		}
+		body = strings.ReplaceAll(body, "[RESULT_CONDITIONS]", formattedConditionResults)
+		url = strings.ReplaceAll(url, "[RESULT_CONDITIONS]", formattedConditionResults)
+	}
+
+	if resolved {
+		body = strings.ReplaceAll(body, "[ALERT_TRIGGERED_OR_RESOLVED]", provider.GetAlertStatePlaceholderValue(cfg, true))
+		url = strings.ReplaceAll(url, "[ALERT_TRIGGERED_OR_RESOLVED]", provider.GetAlertStatePlaceholderValue(cfg, true))
+	} else {
+		body = strings.ReplaceAll(body, "[ALERT_TRIGGERED_OR_RESOLVED]", provider.GetAlertStatePlaceholderValue(cfg, false))
+		url = strings.ReplaceAll(url, "[ALERT_TRIGGERED_OR_RESOLVED]", provider.GetAlertStatePlaceholderValue(cfg, false))
+	}
+	if len(method) == 0 {
+		method = http.MethodGet
+	}
+	bodyBuffer := bytes.NewBuffer([]byte(body))
+	request, _ := http.NewRequest(method, url, bodyBuffer)
+	for k, v := range cfg.Headers {
+		request.Header.Set(k, v)
+	}
+	return request
+}
+
+// GetAlertStatePlaceholderValue returns the Placeholder value for ALERT_TRIGGERED_OR_RESOLVED if configured
+func (provider *AlertProvider) GetAlertStatePlaceholderValue(cfg *Config, resolved bool) string {
+	status := "TRIGGERED"
+	if resolved {
+		status = "RESOLVED"
+	}
+	if _, ok := cfg.Placeholders["ALERT_TRIGGERED_OR_RESOLVED"]; ok {
+		if val, ok := cfg.Placeholders["ALERT_TRIGGERED_OR_RESOLVED"][status]; ok {
+			return val
+		}
+	}
+	return status
+}
+
 // GetDefaultAlert returns the provider's default alert configuration
 func (provider *AlertProvider) GetDefaultAlert() *alert.Alert {
 	return provider.DefaultAlert
 }
+
+// GetConfig returns the configuration for the provider with the overrides applied
+func (provider *AlertProvider) GetConfig(group string, alert *alert.Alert) (*Config, error) {
+	cfg := provider.DefaultConfig
+	// Handle group overrides
+	if provider.Overrides != nil {
+		for _, override := range provider.Overrides {
+			if group == override.Group {
+				cfg.Merge(&override.Config)
+				break
+			}
+		}
+	}
+	// Handle alert overrides
+	if len(alert.ProviderOverride) != 0 {
+		overrideConfig := Config{}
+		if err := yaml.Unmarshal(alert.ProviderOverrideAsBytes(), &overrideConfig); err != nil {
+			return nil, err
+		}
+		cfg.Merge(&overrideConfig)
+	}
+	// Validate the configuration
+	err := cfg.Validate()
+	return &cfg, err
+}
+
+// ValidateOverrides validates the alert's provider override and, if present, the group override
+func (provider *AlertProvider) ValidateOverrides(group string, alert *alert.Alert) error {
+	_, err := provider.GetConfig(group, alert)
+	return err
+}

alerting/provider/custom/custom_test.go

@@ -12,24 +12,18 @@ import (
 	"github.com/TwiN/gatus/v5/test"
 )
 
-func TestAlertProvider_IsValid(t *testing.T) {
+func TestAlertProvider_Validate(t *testing.T) {
 	t.Run("invalid-provider", func(t *testing.T) {
-		invalidProvider := AlertProvider{URL: ""}
-		if invalidProvider.IsValid() {
+		invalidProvider := AlertProvider{DefaultConfig: Config{URL: ""}}
+		if err := invalidProvider.Validate(); err == nil {
 			t.Error("provider shouldn't have been valid")
 		}
 	})
 	t.Run("valid-provider", func(t *testing.T) {
-		validProvider := AlertProvider{URL: "https://example.com"}
-		if validProvider.ClientConfig != nil {
-			t.Error("provider client config should have been nil prior to IsValid() being executed")
-		}
-		if !validProvider.IsValid() {
+		validProvider := AlertProvider{DefaultConfig: Config{URL: "https://example.com"}}
+		if err := validProvider.Validate(); err != nil {
 			t.Error("provider should've been valid")
 		}
-		if validProvider.ClientConfig == nil {
-			t.Error("provider client config should have been set after IsValid() was executed")
-		}
 	})
 }
 
@@ -47,7 +41,7 @@ func TestAlertProvider_Send(t *testing.T) {
 	}{
 		{
 			Name:     "triggered",
-			Provider: AlertProvider{},
+			Provider: AlertProvider{DefaultConfig: Config{URL: "https://example.com"}},
 			Alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved: false,
 			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
@@ -57,7 +51,7 @@ func TestAlertProvider_Send(t *testing.T) {
 		},
 		{
 			Name:     "triggered-error",
-			Provider: AlertProvider{},
+			Provider: AlertProvider{DefaultConfig: Config{URL: "https://example.com"}},
 			Alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved: false,
 			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
@@ -67,7 +61,7 @@ func TestAlertProvider_Send(t *testing.T) {
 		},
 		{
 			Name:     "resolved",
-			Provider: AlertProvider{},
+			Provider: AlertProvider{DefaultConfig: Config{URL: "https://example.com"}},
 			Alert:    alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved: true,
 			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
@@ -77,7 +71,7 @@ func TestAlertProvider_Send(t *testing.T) {
 		},
 		{
 			Name:     "resolved-error",
-			Provider: AlertProvider{},
+			Provider: AlertProvider{DefaultConfig: Config{URL: "https://example.com"}},
 			Alert:    alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved: true,
 			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
@@ -111,9 +105,11 @@ func TestAlertProvider_Send(t *testing.T) {
 }
 
 func TestAlertProvider_buildHTTPRequest(t *testing.T) {
-	customAlertProvider := &AlertProvider{
-		URL:  "https://example.com/[ENDPOINT_GROUP]/[ENDPOINT_NAME]?event=[ALERT_TRIGGERED_OR_RESOLVED]&description=[ALERT_DESCRIPTION]&url=[ENDPOINT_URL]",
-		Body: "[ENDPOINT_NAME],[ENDPOINT_GROUP],[ALERT_DESCRIPTION],[ENDPOINT_URL],[ALERT_TRIGGERED_OR_RESOLVED]",
+	alertProvider := &AlertProvider{
+		DefaultConfig: Config{
+			URL:  "https://example.com/[ENDPOINT_GROUP]/[ENDPOINT_NAME]?event=[ALERT_TRIGGERED_OR_RESOLVED]&description=[ALERT_DESCRIPTION]&url=[ENDPOINT_URL]",
+			Body: "[ENDPOINT_NAME],[ENDPOINT_GROUP],[ALERT_DESCRIPTION],[ENDPOINT_URL],[ALERT_TRIGGERED_OR_RESOLVED]",
+		},
 	}
 	alertDescription := "alert-description"
 	scenarios := []struct {
@@ -123,13 +119,13 @@ func TestAlertProvider_buildHTTPRequest(t *testing.T) {
 		ExpectedBody  string
 	}{
 		{
-			AlertProvider: customAlertProvider,
+			AlertProvider: alertProvider,
 			Resolved:      true,
 			ExpectedURL:   "https://example.com/endpoint-group/endpoint-name?event=RESOLVED&description=alert-description&url=https://example.com",
 			ExpectedBody:  "endpoint-name,endpoint-group,alert-description,https://example.com,RESOLVED",
 		},
 		{
-			AlertProvider: customAlertProvider,
+			AlertProvider: alertProvider,
 			Resolved:      false,
 			ExpectedURL:   "https://example.com/endpoint-group/endpoint-name?event=TRIGGERED&description=alert-description&url=https://example.com",
 			ExpectedBody:  "endpoint-name,endpoint-group,alert-description,https://example.com,TRIGGERED",
@@ -137,9 +133,67 @@ func TestAlertProvider_buildHTTPRequest(t *testing.T) {
 	}
 	for _, scenario := range scenarios {
 		t.Run(fmt.Sprintf("resolved-%v-with-default-placeholders", scenario.Resolved), func(t *testing.T) {
-			request := customAlertProvider.buildHTTPRequest(
+			request := alertProvider.buildHTTPRequest(
+				&alertProvider.DefaultConfig,
 				&endpoint.Endpoint{Name: "endpoint-name", Group: "endpoint-group", URL: "https://example.com"},
 				&alert.Alert{Description: &alertDescription},
+				&endpoint.Result{Errors: []string{}},
+				scenario.Resolved,
+			)
+			if request.URL.String() != scenario.ExpectedURL {
+				t.Error("expected URL to be", scenario.ExpectedURL, "got", request.URL.String())
+			}
+			body, _ := io.ReadAll(request.Body)
+			if string(body) != scenario.ExpectedBody {
+				t.Error("expected body to be", scenario.ExpectedBody, "got", string(body))
+			}
+		})
+	}
+}
+
+func TestAlertProviderWithResultErrors_buildHTTPRequest(t *testing.T) {
+	alertProvider := &AlertProvider{
+		DefaultConfig: Config{
+			URL:  "https://example.com/[ENDPOINT_GROUP]/[ENDPOINT_NAME]?event=[ALERT_TRIGGERED_OR_RESOLVED]&description=[ALERT_DESCRIPTION]&url=[ENDPOINT_URL]&error=[RESULT_ERRORS]",
+			Body: "[ENDPOINT_NAME],[ENDPOINT_GROUP],[ALERT_DESCRIPTION],[ENDPOINT_URL],[ALERT_TRIGGERED_OR_RESOLVED],[RESULT_ERRORS]",
+		},
+	}
+	alertDescription := "alert-description"
+	scenarios := []struct {
+		AlertProvider *AlertProvider
+		Resolved      bool
+		ExpectedURL   string
+		ExpectedBody  string
+		Errors        []string
+	}{
+		{
+			AlertProvider: alertProvider,
+			Resolved:      true,
+			ExpectedURL:   "https://example.com/endpoint-group/endpoint-name?event=RESOLVED&description=alert-description&url=https://example.com&error=",
+			ExpectedBody:  "endpoint-name,endpoint-group,alert-description,https://example.com,RESOLVED,",
+		},
+		{
+			AlertProvider: alertProvider,
+			Resolved:      false,
+			ExpectedURL:   "https://example.com/endpoint-group/endpoint-name?event=TRIGGERED&description=alert-description&url=https://example.com&error=error1,error2",
+			ExpectedBody:  "endpoint-name,endpoint-group,alert-description,https://example.com,TRIGGERED,error1,error2",
+			Errors:        []string{"error1", "error2"},
+		},
+		{
+			AlertProvider: alertProvider,
+			Resolved:      false,
+			ExpectedURL:   "https://example.com/endpoint-group/endpoint-name?event=TRIGGERED&description=alert-description&url=https://example.com&error=test \\\"error with quotes\\\"",
+			ExpectedBody:  "endpoint-name,endpoint-group,alert-description,https://example.com,TRIGGERED,test \\\"error with quotes\\\"",
+			Errors:        []string{"test \"error with quotes\""},
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(fmt.Sprintf("resolved-%v-with-default-placeholders-and-result-errors", scenario.Resolved), func(t *testing.T) {
+			request := alertProvider.buildHTTPRequest(
+				&alertProvider.DefaultConfig,
+				&endpoint.Endpoint{Name: "endpoint-name", Group: "endpoint-group", URL: "https://example.com"},
+				&alert.Alert{Description: &alertDescription},
+				&endpoint.Result{Errors: scenario.Errors},
 				scenario.Resolved,
 			)
 			if request.URL.String() != scenario.ExpectedURL {
@@ -154,14 +208,16 @@ func TestAlertProvider_buildHTTPRequest(t *testing.T) {
 }
 
 func TestAlertProvider_buildHTTPRequestWithCustomPlaceholder(t *testing.T) {
-	customAlertProvider := &AlertProvider{
-		URL:     "https://example.com/[ENDPOINT_GROUP]/[ENDPOINT_NAME]?event=[ALERT_TRIGGERED_OR_RESOLVED]&description=[ALERT_DESCRIPTION]",
-		Body:    "[ENDPOINT_NAME],[ENDPOINT_GROUP],[ALERT_DESCRIPTION],[ALERT_TRIGGERED_OR_RESOLVED]",
-		Headers: nil,
-		Placeholders: map[string]map[string]string{
-			"ALERT_TRIGGERED_OR_RESOLVED": {
-				"RESOLVED":  "fixed",
-				"TRIGGERED": "boom",
+	alertProvider := &AlertProvider{
+		DefaultConfig: Config{
+			URL:     "https://example.com/[ENDPOINT_GROUP]/[ENDPOINT_NAME]?event=[ALERT_TRIGGERED_OR_RESOLVED]&description=[ALERT_DESCRIPTION]",
+			Body:    "[ENDPOINT_NAME],[ENDPOINT_GROUP],[ALERT_DESCRIPTION],[ALERT_TRIGGERED_OR_RESOLVED]",
+			Headers: nil,
+			Placeholders: map[string]map[string]string{
+				"ALERT_TRIGGERED_OR_RESOLVED": {
+					"RESOLVED":  "fixed",
+					"TRIGGERED": "boom",
+				},
 			},
 		},
 	}
@@ -173,13 +229,13 @@ func TestAlertProvider_buildHTTPRequestWithCustomPlaceholder(t *testing.T) {
 		ExpectedBody  string
 	}{
 		{
-			AlertProvider: customAlertProvider,
+			AlertProvider: alertProvider,
 			Resolved:      true,
 			ExpectedURL:   "https://example.com/endpoint-group/endpoint-name?event=fixed&description=alert-description",
 			ExpectedBody:  "endpoint-name,endpoint-group,alert-description,fixed",
 		},
 		{
-			AlertProvider: customAlertProvider,
+			AlertProvider: alertProvider,
 			Resolved:      false,
 			ExpectedURL:   "https://example.com/endpoint-group/endpoint-name?event=boom&description=alert-description",
 			ExpectedBody:  "endpoint-name,endpoint-group,alert-description,boom",
@@ -187,9 +243,74 @@ func TestAlertProvider_buildHTTPRequestWithCustomPlaceholder(t *testing.T) {
 	}
 	for _, scenario := range scenarios {
 		t.Run(fmt.Sprintf("resolved-%v-with-custom-placeholders", scenario.Resolved), func(t *testing.T) {
-			request := customAlertProvider.buildHTTPRequest(
+			request := alertProvider.buildHTTPRequest(
+				&alertProvider.DefaultConfig,
 				&endpoint.Endpoint{Name: "endpoint-name", Group: "endpoint-group"},
 				&alert.Alert{Description: &alertDescription},
+				&endpoint.Result{},
+				scenario.Resolved,
+			)
+			if request.URL.String() != scenario.ExpectedURL {
+				t.Error("expected URL to be", scenario.ExpectedURL, "got", request.URL.String())
+			}
+			body, _ := io.ReadAll(request.Body)
+			if string(body) != scenario.ExpectedBody {
+				t.Error("expected body to be", scenario.ExpectedBody, "got", string(body))
+			}
+		})
+	}
+}
+
+func TestAlertProvider_buildHTTPRequestWithCustomPlaceholderAndResultConditions(t *testing.T) {
+	alertProvider := &AlertProvider{
+		DefaultConfig: Config{
+			URL:     "https://example.com/[ENDPOINT_GROUP]/[ENDPOINT_NAME]?event=[ALERT_TRIGGERED_OR_RESOLVED]&description=[ALERT_DESCRIPTION]",
+			Body:    "[ENDPOINT_NAME],[ENDPOINT_GROUP],[ALERT_DESCRIPTION],[ALERT_TRIGGERED_OR_RESOLVED],[RESULT_CONDITIONS]",
+			Headers: nil,
+			Placeholders: map[string]map[string]string{
+				"ALERT_TRIGGERED_OR_RESOLVED": {
+					"RESOLVED":  "fixed",
+					"TRIGGERED": "boom",
+				},
+			},
+		},
+	}
+	alertDescription := "alert-description"
+	scenarios := []struct {
+		AlertProvider *AlertProvider
+		Resolved      bool
+		ExpectedURL   string
+		ExpectedBody  string
+		NoConditions  bool
+	}{
+		{
+			AlertProvider: alertProvider,
+			Resolved:      true,
+			ExpectedURL:   "https://example.com/endpoint-group/endpoint-name?event=fixed&description=alert-description",
+			ExpectedBody:  "endpoint-name,endpoint-group,alert-description,fixed,✅ - `[CONNECTED] == true`, ✅ - `[STATUS] == 200`",
+		},
+		{
+			AlertProvider: alertProvider,
+			Resolved:      false,
+			ExpectedURL:   "https://example.com/endpoint-group/endpoint-name?event=boom&description=alert-description",
+			ExpectedBody:  "endpoint-name,endpoint-group,alert-description,boom,❌ - `[CONNECTED] == true`, ❌ - `[STATUS] == 200`",
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(fmt.Sprintf("resolved-%v-with-custom-placeholders", scenario.Resolved), func(t *testing.T) {
+			var conditionResults []*endpoint.ConditionResult
+			if !scenario.NoConditions {
+				conditionResults = []*endpoint.ConditionResult{
+					{Condition: "[CONNECTED] == true", Success: scenario.Resolved},
+					{Condition: "[STATUS] == 200", Success: scenario.Resolved},
+				}
+			}
+
+			request := alertProvider.buildHTTPRequest(
+				&alertProvider.DefaultConfig,
+				&endpoint.Endpoint{Name: "endpoint-name", Group: "endpoint-group"},
+				&alert.Alert{Description: &alertDescription},
+				&endpoint.Result{ConditionResults: conditionResults},
 				scenario.Resolved,
 			)
 			if request.URL.String() != scenario.ExpectedURL {
@@ -204,15 +325,17 @@ func TestAlertProvider_buildHTTPRequestWithCustomPlaceholder(t *testing.T) {
 }
 
 func TestAlertProvider_GetAlertStatePlaceholderValueDefaults(t *testing.T) {
-	customAlertProvider := &AlertProvider{
-		URL:  "https://example.com/[ENDPOINT_NAME]?event=[ALERT_TRIGGERED_OR_RESOLVED]&description=[ALERT_DESCRIPTION]",
-		Body: "[ENDPOINT_NAME],[ENDPOINT_GROUP],[ALERT_DESCRIPTION],[ALERT_TRIGGERED_OR_RESOLVED]",
+	alertProvider := &AlertProvider{
+		DefaultConfig: Config{
+			URL:  "https://example.com/[ENDPOINT_NAME]?event=[ALERT_TRIGGERED_OR_RESOLVED]&description=[ALERT_DESCRIPTION]",
+			Body: "[ENDPOINT_NAME],[ENDPOINT_GROUP],[ALERT_DESCRIPTION],[ALERT_TRIGGERED_OR_RESOLVED]",
+		},
 	}
-	if customAlertProvider.GetAlertStatePlaceholderValue(true) != "RESOLVED" {
-		t.Error("expected RESOLVED, got", customAlertProvider.GetAlertStatePlaceholderValue(true))
+	if alertProvider.GetAlertStatePlaceholderValue(&alertProvider.DefaultConfig, true) != "RESOLVED" {
+		t.Error("expected RESOLVED, got", alertProvider.GetAlertStatePlaceholderValue(&alertProvider.DefaultConfig, true))
 	}
-	if customAlertProvider.GetAlertStatePlaceholderValue(false) != "TRIGGERED" {
-		t.Error("expected TRIGGERED, got", customAlertProvider.GetAlertStatePlaceholderValue(false))
+	if alertProvider.GetAlertStatePlaceholderValue(&alertProvider.DefaultConfig, false) != "TRIGGERED" {
+		t.Error("expected TRIGGERED, got", alertProvider.GetAlertStatePlaceholderValue(&alertProvider.DefaultConfig, false))
 	}
 }
 
@@ -224,3 +347,119 @@ func TestAlertProvider_GetDefaultAlert(t *testing.T) {
 		t.Error("expected default alert to be nil")
 	}
 }
+
+func TestAlertProvider_GetConfig(t *testing.T) {
+	scenarios := []struct {
+		Name           string
+		Provider       AlertProvider
+		InputGroup     string
+		InputAlert     alert.Alert
+		ExpectedOutput Config
+	}{
+		{
+			Name: "provider-no-override-specify-no-group-should-default",
+			Provider: AlertProvider{
+				DefaultConfig: Config{URL: "http://example.com", Body: "default-body"},
+				Overrides:     nil,
+			},
+			InputGroup:     "",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{URL: "http://example.com", Body: "default-body"},
+		},
+		{
+			Name: "provider-no-override-specify-group-should-default",
+			Provider: AlertProvider{
+				DefaultConfig: Config{URL: "http://example.com"},
+				Overrides:     nil,
+			},
+			InputGroup:     "group",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{URL: "http://example.com"},
+		},
+		{
+			Name: "provider-with-override-specify-no-group-should-default",
+			Provider: AlertProvider{
+				DefaultConfig: Config{URL: "http://example.com"},
+				Overrides: []Override{
+					{
+						Group:  "group",
+						Config: Config{URL: "http://group-example.com", Headers: map[string]string{"Cache": "true"}},
+					},
+				},
+			},
+			InputGroup:     "",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{URL: "http://example.com", Headers: map[string]string{"Cache": "true"}},
+		},
+		{
+			Name: "provider-with-override-specify-group-should-override",
+			Provider: AlertProvider{
+				DefaultConfig: Config{URL: "http://example.com", Body: "default-body"},
+				Overrides: []Override{
+					{
+						Group:  "group",
+						Config: Config{URL: "http://group-example.com", Body: "group-body"},
+					},
+				},
+			},
+			InputGroup:     "group",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{URL: "http://group-example.com", Body: "group-body"},
+		},
+		{
+			Name: "provider-with-group-override-and-alert-override--alert-override-should-take-precedence",
+			Provider: AlertProvider{
+				DefaultConfig: Config{URL: "http://example.com"},
+				Overrides: []Override{
+					{
+						Group:  "group",
+						Config: Config{URL: "http://group-example.com"},
+					},
+				},
+			},
+			InputGroup:     "group",
+			InputAlert:     alert.Alert{ProviderOverride: map[string]any{"url": "http://alert-example.com", "body": "alert-body"}},
+			ExpectedOutput: Config{URL: "http://alert-example.com", Body: "alert-body"},
+		},
+		{
+			Name: "provider-with-partial-overrides",
+			Provider: AlertProvider{
+				DefaultConfig: Config{URL: "http://example.com"},
+				Overrides: []Override{
+					{
+						Group:  "group",
+						Config: Config{Method: "POST"},
+					},
+				},
+			},
+			InputGroup:     "group",
+			InputAlert:     alert.Alert{ProviderOverride: map[string]any{"body": "alert-body"}},
+			ExpectedOutput: Config{URL: "http://example.com", Body: "alert-body", Method: "POST"},
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(scenario.Name, func(t *testing.T) {
+			got, err := scenario.Provider.GetConfig(scenario.InputGroup, &scenario.InputAlert)
+			if err != nil {
+				t.Fatalf("unexpected error: %s", err)
+			}
+			if got.URL != scenario.ExpectedOutput.URL {
+				t.Errorf("expected webhook URL to be %s, got %s", scenario.ExpectedOutput.URL, got.URL)
+			}
+			if got.Body != scenario.ExpectedOutput.Body {
+				t.Errorf("expected body to be %s, got %s", scenario.ExpectedOutput.Body, got.Body)
+			}
+			if got.Headers != nil {
+				for key, value := range scenario.ExpectedOutput.Headers {
+					if got.Headers[key] != value {
+						t.Errorf("expected header %s to be %s, got %s", key, value, got.Headers[key])
+					}
+				}
+			}
+			// Test ValidateOverrides as well, since it really just calls GetConfig
+			if err = scenario.Provider.ValidateOverrides(scenario.InputGroup, &scenario.InputAlert); err != nil {
+				t.Errorf("unexpected error: %s", err)
+			}
+		})
+	}
+}

alerting/provider/datadog/datadog.go

@@ -0,0 +1,214 @@
+package datadog
+
+import (
+	"bytes"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"net/http"
+	"time"
+
+	"github.com/TwiN/gatus/v5/alerting/alert"
+	"github.com/TwiN/gatus/v5/client"
+	"github.com/TwiN/gatus/v5/config/endpoint"
+	"gopkg.in/yaml.v3"
+)
+
+var (
+	ErrAPIKeyNotSet           = errors.New("api-key not set")
+	ErrDuplicateGroupOverride = errors.New("duplicate group override")
+)
+
+type Config struct {
+	APIKey string   `yaml:"api-key"`        // Datadog API key
+	Site   string   `yaml:"site,omitempty"` // Datadog site (e.g., datadoghq.com, datadoghq.eu)
+	Tags   []string `yaml:"tags,omitempty"` // Additional tags to include
+}
+
+func (cfg *Config) Validate() error {
+	if len(cfg.APIKey) == 0 {
+		return ErrAPIKeyNotSet
+	}
+	return nil
+}
+
+func (cfg *Config) Merge(override *Config) {
+	if len(override.APIKey) > 0 {
+		cfg.APIKey = override.APIKey
+	}
+	if len(override.Site) > 0 {
+		cfg.Site = override.Site
+	}
+	if len(override.Tags) > 0 {
+		cfg.Tags = override.Tags
+	}
+}
+
+// AlertProvider is the configuration necessary for sending an alert using Datadog
+type AlertProvider struct {
+	DefaultConfig Config `yaml:",inline"`
+
+	// DefaultAlert is the default alert configuration to use for endpoints with an alert of the appropriate type
+	DefaultAlert *alert.Alert `yaml:"default-alert,omitempty"`
+
+	// Overrides is a list of Override that may be prioritized over the default configuration
+	Overrides []Override `yaml:"overrides,omitempty"`
+}
+
+// Override is a case under which the default integration is overridden
+type Override struct {
+	Group  string `yaml:"group"`
+	Config `yaml:",inline"`
+}
+
+// Validate the provider's configuration
+func (provider *AlertProvider) Validate() error {
+	registeredGroups := make(map[string]bool)
+	if provider.Overrides != nil {
+		for _, override := range provider.Overrides {
+			if isAlreadyRegistered := registeredGroups[override.Group]; isAlreadyRegistered || override.Group == "" {
+				return ErrDuplicateGroupOverride
+			}
+			registeredGroups[override.Group] = true
+		}
+	}
+	return provider.DefaultConfig.Validate()
+}
+
+// Send an alert using the provider
+func (provider *AlertProvider) Send(ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) error {
+	cfg, err := provider.GetConfig(ep.Group, alert)
+	if err != nil {
+		return err
+	}
+	site := cfg.Site
+	if site == "" {
+		site = "datadoghq.com"
+	}
+	body, err := provider.buildRequestBody(cfg, ep, alert, result, resolved)
+	if err != nil {
+		return err
+	}
+	buffer := bytes.NewBuffer(body)
+	url := fmt.Sprintf("https://api.%s/api/v1/events", site)
+	request, err := http.NewRequest(http.MethodPost, url, buffer)
+	if err != nil {
+		return err
+	}
+	request.Header.Set("Content-Type", "application/json")
+	request.Header.Set("DD-API-KEY", cfg.APIKey)
+	response, err := client.GetHTTPClient(nil).Do(request)
+	if err != nil {
+		return err
+	}
+	defer response.Body.Close()
+	if response.StatusCode >= 400 {
+		body, _ := io.ReadAll(response.Body)
+		return fmt.Errorf("call to datadog alert returned status code %d: %s", response.StatusCode, string(body))
+	}
+	return nil
+}
+
+type Body struct {
+	Title        string   `json:"title"`
+	Text         string   `json:"text"`
+	Priority     string   `json:"priority"`
+	Tags         []string `json:"tags"`
+	AlertType    string   `json:"alert_type"`
+	SourceType   string   `json:"source_type_name"`
+	DateHappened int64    `json:"date_happened,omitempty"`
+}
+
+// buildRequestBody builds the request body for the provider
+func (provider *AlertProvider) buildRequestBody(cfg *Config, ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) ([]byte, error) {
+	var title, text, priority, alertType string
+	if resolved {
+		title = fmt.Sprintf("Resolved: %s", ep.DisplayName())
+		text = fmt.Sprintf("Alert for %s has been resolved after passing successfully %d time(s) in a row", ep.DisplayName(), alert.SuccessThreshold)
+		priority = "normal"
+		alertType = "success"
+	} else {
+		title = fmt.Sprintf("Alert: %s", ep.DisplayName())
+		text = fmt.Sprintf("Alert for %s has been triggered due to having failed %d time(s) in a row", ep.DisplayName(), alert.FailureThreshold)
+		priority = "normal"
+		alertType = "error"
+	}
+	if alertDescription := alert.GetDescription(); len(alertDescription) > 0 {
+		text += fmt.Sprintf("\n\nDescription: %s", alertDescription)
+	}
+	if len(result.ConditionResults) > 0 {
+		text += "\n\nCondition Results:"
+		for _, conditionResult := range result.ConditionResults {
+			var status string
+			if conditionResult.Success {
+				status = "✅"
+			} else {
+				status = "❌"
+			}
+			text += fmt.Sprintf("\n%s %s", status, conditionResult.Condition)
+		}
+	}
+	tags := []string{
+		"source:gatus",
+		fmt.Sprintf("endpoint:%s", ep.Name),
+		fmt.Sprintf("status:%s", alertType),
+	}
+	if ep.Group != "" {
+		tags = append(tags, fmt.Sprintf("group:%s", ep.Group))
+	}
+	// Append custom tags
+	if len(cfg.Tags) > 0 {
+		tags = append(tags, cfg.Tags...)
+	}
+	body := Body{
+		Title:        title,
+		Text:         text,
+		Priority:     priority,
+		Tags:         tags,
+		AlertType:    alertType,
+		SourceType:   "gatus",
+		DateHappened: time.Now().Unix(),
+	}
+	bodyAsJSON, err := json.Marshal(body)
+	if err != nil {
+		return nil, err
+	}
+	return bodyAsJSON, nil
+}
+
+// GetDefaultAlert returns the provider's default alert configuration
+func (provider *AlertProvider) GetDefaultAlert() *alert.Alert {
+	return provider.DefaultAlert
+}
+
+// GetConfig returns the configuration for the provider with the overrides applied
+func (provider *AlertProvider) GetConfig(group string, alert *alert.Alert) (*Config, error) {
+	cfg := provider.DefaultConfig
+	// Handle group overrides
+	if provider.Overrides != nil {
+		for _, override := range provider.Overrides {
+			if group == override.Group {
+				cfg.Merge(&override.Config)
+				break
+			}
+		}
+	}
+	// Handle alert overrides
+	if len(alert.ProviderOverride) != 0 {
+		overrideConfig := Config{}
+		if err := yaml.Unmarshal(alert.ProviderOverrideAsBytes(), &overrideConfig); err != nil {
+			return nil, err
+		}
+		cfg.Merge(&overrideConfig)
+	}
+	// Validate the configuration
+	err := cfg.Validate()
+	return &cfg, err
+}
+
+// ValidateOverrides validates the alert's provider override and, if present, the group override
+func (provider *AlertProvider) ValidateOverrides(group string, alert *alert.Alert) error {
+	_, err := provider.GetConfig(group, alert)
+	return err
+}

alerting/provider/datadog/datadog_test.go

@@ -0,0 +1,183 @@
+package datadog
+
+import (
+	"encoding/json"
+	"net/http"
+	"strings"
+	"testing"
+
+	"github.com/TwiN/gatus/v5/alerting/alert"
+	"github.com/TwiN/gatus/v5/client"
+	"github.com/TwiN/gatus/v5/config/endpoint"
+	"github.com/TwiN/gatus/v5/test"
+)
+
+func TestAlertProvider_Validate(t *testing.T) {
+	scenarios := []struct {
+		name     string
+		provider AlertProvider
+		expected error
+	}{
+		{
+			name:     "valid-us1",
+			provider: AlertProvider{DefaultConfig: Config{APIKey: "dd-api-key-123", Site: "datadoghq.com"}},
+			expected: nil,
+		},
+		{
+			name:     "valid-eu",
+			provider: AlertProvider{DefaultConfig: Config{APIKey: "dd-api-key-123", Site: "datadoghq.eu"}},
+			expected: nil,
+		},
+		{
+			name:     "valid-with-tags",
+			provider: AlertProvider{DefaultConfig: Config{APIKey: "dd-api-key-123", Site: "datadoghq.com", Tags: []string{"env:prod", "service:gatus"}}},
+			expected: nil,
+		},
+		{
+			name:     "invalid-api-key",
+			provider: AlertProvider{DefaultConfig: Config{Site: "datadoghq.com"}},
+			expected: ErrAPIKeyNotSet,
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(scenario.name, func(t *testing.T) {
+			err := scenario.provider.Validate()
+			if err != scenario.expected {
+				t.Errorf("expected %v, got %v", scenario.expected, err)
+			}
+		})
+	}
+}
+
+func TestAlertProvider_Send(t *testing.T) {
+	defer client.InjectHTTPClient(nil)
+	firstDescription := "description-1"
+	secondDescription := "description-2"
+	scenarios := []struct {
+		name             string
+		provider         AlertProvider
+		alert            alert.Alert
+		resolved         bool
+		mockRoundTripper test.MockRoundTripper
+		expectedError    bool
+	}{
+		{
+			name:     "triggered",
+			provider: AlertProvider{DefaultConfig: Config{APIKey: "dd-api-key-123", Site: "datadoghq.com"}},
+			alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			resolved: false,
+			mockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
+				if r.Host != "api.datadoghq.com" {
+					t.Errorf("expected host api.datadoghq.com, got %s", r.Host)
+				}
+				if r.URL.Path != "/api/v1/events" {
+					t.Errorf("expected path /api/v1/events, got %s", r.URL.Path)
+				}
+				if r.Header.Get("DD-API-KEY") != "dd-api-key-123" {
+					t.Errorf("expected DD-API-KEY header to be 'dd-api-key-123', got %s", r.Header.Get("DD-API-KEY"))
+				}
+				body := make(map[string]interface{})
+				json.NewDecoder(r.Body).Decode(&body)
+				if body["title"] == nil {
+					t.Error("expected 'title' field in request body")
+				}
+				title := body["title"].(string)
+				if !strings.Contains(title, "Alert") {
+					t.Errorf("expected title to contain 'Alert', got %s", title)
+				}
+				if body["alert_type"] != "error" {
+					t.Errorf("expected alert_type to be 'error', got %v", body["alert_type"])
+				}
+				if body["priority"] != "normal" {
+					t.Errorf("expected priority to be 'normal', got %v", body["priority"])
+				}
+				text := body["text"].(string)
+				if !strings.Contains(text, "failed 3 time(s)") {
+					t.Errorf("expected text to contain failure count, got %s", text)
+				}
+				return &http.Response{StatusCode: http.StatusAccepted, Body: http.NoBody}
+			}),
+			expectedError: false,
+		},
+		{
+			name:     "triggered-with-tags",
+			provider: AlertProvider{DefaultConfig: Config{APIKey: "dd-api-key-123", Site: "datadoghq.com", Tags: []string{"env:prod", "service:gatus"}}},
+			alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			resolved: false,
+			mockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
+				body := make(map[string]interface{})
+				json.NewDecoder(r.Body).Decode(&body)
+				tags := body["tags"].([]interface{})
+				// Datadog adds 3 base tags (source, endpoint, status) + custom tags
+				if len(tags) < 5 {
+					t.Errorf("expected at least 5 tags (3 base + 2 custom), got %d", len(tags))
+				}
+				return &http.Response{StatusCode: http.StatusAccepted, Body: http.NoBody}
+			}),
+			expectedError: false,
+		},
+		{
+			name:     "resolved",
+			provider: AlertProvider{DefaultConfig: Config{APIKey: "dd-api-key-123", Site: "datadoghq.eu"}},
+			alert:    alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			resolved: true,
+			mockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
+				if r.Host != "api.datadoghq.eu" {
+					t.Errorf("expected host api.datadoghq.eu, got %s", r.Host)
+				}
+				body := make(map[string]interface{})
+				json.NewDecoder(r.Body).Decode(&body)
+				title := body["title"].(string)
+				if !strings.Contains(title, "Resolved") {
+					t.Errorf("expected title to contain 'Resolved', got %s", title)
+				}
+				if body["alert_type"] != "success" {
+					t.Errorf("expected alert_type to be 'success', got %v", body["alert_type"])
+				}
+				return &http.Response{StatusCode: http.StatusAccepted, Body: http.NoBody}
+			}),
+			expectedError: false,
+		},
+		{
+			name:     "error-response",
+			provider: AlertProvider{DefaultConfig: Config{APIKey: "dd-api-key-123", Site: "datadoghq.com"}},
+			alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			resolved: false,
+			mockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
+				return &http.Response{StatusCode: http.StatusForbidden, Body: http.NoBody}
+			}),
+			expectedError: true,
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(scenario.name, func(t *testing.T) {
+			client.InjectHTTPClient(&http.Client{Transport: scenario.mockRoundTripper})
+			err := scenario.provider.Send(
+				&endpoint.Endpoint{Name: "endpoint-name"},
+				&scenario.alert,
+				&endpoint.Result{
+					ConditionResults: []*endpoint.ConditionResult{
+						{Condition: "[CONNECTED] == true", Success: scenario.resolved},
+						{Condition: "[STATUS] == 200", Success: scenario.resolved},
+					},
+				},
+				scenario.resolved,
+			)
+			if scenario.expectedError && err == nil {
+				t.Error("expected error, got none")
+			}
+			if !scenario.expectedError && err != nil {
+				t.Error("expected no error, got", err.Error())
+			}
+		})
+	}
+}
+
+func TestAlertProvider_GetDefaultAlert(t *testing.T) {
+	if (&AlertProvider{DefaultAlert: &alert.Alert{}}).GetDefaultAlert() == nil {
+		t.Error("expected default alert to be not nil")
+	}
+	if (&AlertProvider{DefaultAlert: nil}).GetDefaultAlert() != nil {
+		t.Error("expected default alert to be nil")
+	}
+}

alerting/provider/discord/discord.go

@@ -3,6 +3,7 @@ package discord
 import (
 	"bytes"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"io"
 	"net/http"
@@ -10,46 +11,77 @@ import (
 	"github.com/TwiN/gatus/v5/alerting/alert"
 	"github.com/TwiN/gatus/v5/client"
 	"github.com/TwiN/gatus/v5/config/endpoint"
+	"gopkg.in/yaml.v3"
 )
 
+var (
+	ErrWebhookURLNotSet       = errors.New("webhook-url not set")
+	ErrDuplicateGroupOverride = errors.New("duplicate group override")
+)
+
+type Config struct {
+	WebhookURL     string `yaml:"webhook-url"`
+	Title          string `yaml:"title,omitempty"`           // Title of the message that will be sent
+	MessageContent string `yaml:"message-content,omitempty"` // Message content for pinging users or groups (e.g. "<@123456789>" or "<@&987654321>")
+}
+
+func (cfg *Config) Validate() error {
+	if len(cfg.WebhookURL) == 0 {
+		return ErrWebhookURLNotSet
+	}
+	return nil
+}
+
+func (cfg *Config) Merge(override *Config) {
+	if len(override.WebhookURL) > 0 {
+		cfg.WebhookURL = override.WebhookURL
+	}
+	if len(override.Title) > 0 {
+		cfg.Title = override.Title
+	}
+	if len(override.MessageContent) > 0 {
+		cfg.MessageContent = override.MessageContent
+	}
+}
+
 // AlertProvider is the configuration necessary for sending an alert using Discord
 type AlertProvider struct {
-	WebhookURL string `yaml:"webhook-url"`
+	DefaultConfig Config `yaml:",inline"`
 
 	// DefaultAlert is the default alert configuration to use for endpoints with an alert of the appropriate type
 	DefaultAlert *alert.Alert `yaml:"default-alert,omitempty"`
 
 	// Overrides is a list of Override that may be prioritized over the default configuration
 	Overrides []Override `yaml:"overrides,omitempty"`
-
-	// Title is the title of the message that will be sent
-	Title string `yaml:"title,omitempty"`
 }
 
-// Override is a case under which the default integration is overridden
 type Override struct {
-	Group      string `yaml:"group"`
-	WebhookURL string `yaml:"webhook-url"`
+	Group  string `yaml:"group"`
+	Config `yaml:",inline"`
 }
 
-// IsValid returns whether the provider's configuration is valid
-func (provider *AlertProvider) IsValid() bool {
+// Validate the provider's configuration
+func (provider *AlertProvider) Validate() error {
 	registeredGroups := make(map[string]bool)
 	if provider.Overrides != nil {
 		for _, override := range provider.Overrides {
 			if isAlreadyRegistered := registeredGroups[override.Group]; isAlreadyRegistered || override.Group == "" || len(override.WebhookURL) == 0 {
-				return false
+				return ErrDuplicateGroupOverride
 			}
 			registeredGroups[override.Group] = true
 		}
 	}
-	return len(provider.WebhookURL) > 0
+	return provider.DefaultConfig.Validate()
 }
 
 // Send an alert using the provider
 func (provider *AlertProvider) Send(ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) error {
-	buffer := bytes.NewBuffer(provider.buildRequestBody(ep, alert, result, resolved))
-	request, err := http.NewRequest(http.MethodPost, provider.getWebhookURLForGroup(ep.Group), buffer)
+	cfg, err := provider.GetConfig(ep.Group, alert)
+	if err != nil {
+		return err
+	}
+	buffer := bytes.NewBuffer(provider.buildRequestBody(cfg, ep, alert, result, resolved))
+	request, err := http.NewRequest(http.MethodPost, cfg.WebhookURL, buffer)
 	if err != nil {
 		return err
 	}
@@ -85,7 +117,7 @@ type Field struct {
 }
 
 // buildRequestBody builds the request body for the provider
-func (provider *AlertProvider) buildRequestBody(ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) []byte {
+func (provider *AlertProvider) buildRequestBody(cfg *Config, ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) []byte {
 	var message string
 	var colorCode int
 	if resolved {
@@ -110,11 +142,11 @@ func (provider *AlertProvider) buildRequestBody(ep *endpoint.Endpoint, alert *al
 		description = ":\n> " + alertDescription
 	}
 	title := ":helmet_with_white_cross: Gatus"
-	if provider.Title != "" {
-		title = provider.Title
+	if cfg.Title != "" {
+		title = cfg.Title
 	}
 	body := Body{
-		Content: "",
+		Content: cfg.MessageContent,
 		Embeds: []Embed{
 			{
 				Title:       title,
@@ -134,19 +166,38 @@ func (provider *AlertProvider) buildRequestBody(ep *endpoint.Endpoint, alert *al
 	return bodyAsJSON
 }
 
-// getWebhookURLForGroup returns the appropriate Webhook URL integration to for a given group
-func (provider *AlertProvider) getWebhookURLForGroup(group string) string {
-	if provider.Overrides != nil {
-		for _, override := range provider.Overrides {
-			if group == override.Group {
-				return override.WebhookURL
-			}
-		}
-	}
-	return provider.WebhookURL
-}
-
 // GetDefaultAlert returns the provider's default alert configuration
 func (provider *AlertProvider) GetDefaultAlert() *alert.Alert {
 	return provider.DefaultAlert
 }
+
+// GetConfig returns the configuration for the provider with the overrides applied
+func (provider *AlertProvider) GetConfig(group string, alert *alert.Alert) (*Config, error) {
+	cfg := provider.DefaultConfig
+	// Handle group overrides
+	if provider.Overrides != nil {
+		for _, override := range provider.Overrides {
+			if group == override.Group {
+				cfg.Merge(&override.Config)
+				break
+			}
+		}
+	}
+	// Handle alert overrides
+	if len(alert.ProviderOverride) != 0 {
+		overrideConfig := Config{}
+		if err := yaml.Unmarshal(alert.ProviderOverrideAsBytes(), &overrideConfig); err != nil {
+			return nil, err
+		}
+		cfg.Merge(&overrideConfig)
+	}
+	// Validate the configuration
+	err := cfg.Validate()
+	return &cfg, err
+}
+
+// ValidateOverrides validates the alert's provider override and, if present, the group override
+func (provider *AlertProvider) ValidateOverrides(group string, alert *alert.Alert) error {
+	_, err := provider.GetConfig(group, alert)
+	return err
+}

alerting/provider/discord/discord_test.go

@@ -11,50 +11,52 @@ import (
 	"github.com/TwiN/gatus/v5/test"
 )
 
-func TestAlertProvider_IsValid(t *testing.T) {
-	invalidProvider := AlertProvider{WebhookURL: ""}
-	if invalidProvider.IsValid() {
+func TestAlertProvider_Validate(t *testing.T) {
+	invalidProvider := AlertProvider{DefaultConfig: Config{WebhookURL: ""}}
+	if err := invalidProvider.Validate(); err == nil {
 		t.Error("provider shouldn't have been valid")
 	}
-	validProvider := AlertProvider{WebhookURL: "http://example.com"}
-	if !validProvider.IsValid() {
+	validProvider := AlertProvider{DefaultConfig: Config{WebhookURL: "http://example.com"}}
+	if err := validProvider.Validate(); err != nil {
 		t.Error("provider should've been valid")
 	}
 }
 
-func TestAlertProvider_IsValidWithOverride(t *testing.T) {
+func TestAlertProvider_ValidateWithOverride(t *testing.T) {
 	providerWithInvalidOverrideGroup := AlertProvider{
 		Overrides: []Override{
 			{
-				WebhookURL: "http://example.com",
-				Group:      "",
+				Config: Config{WebhookURL: "http://example.com"},
+				Group:  "",
 			},
 		},
 	}
-	if providerWithInvalidOverrideGroup.IsValid() {
+	if err := providerWithInvalidOverrideGroup.Validate(); err == nil {
 		t.Error("provider Group shouldn't have been valid")
 	}
 	providerWithInvalidOverrideTo := AlertProvider{
 		Overrides: []Override{
 			{
-				WebhookURL: "",
-				Group:      "group",
+				Config: Config{WebhookURL: ""},
+				Group:  "group",
 			},
 		},
 	}
-	if providerWithInvalidOverrideTo.IsValid() {
+	if err := providerWithInvalidOverrideTo.Validate(); err == nil {
 		t.Error("provider integration key shouldn't have been valid")
 	}
 	providerWithValidOverride := AlertProvider{
-		WebhookURL: "http://example.com",
+		DefaultConfig: Config{
+			WebhookURL: "http://example.com",
+		},
 		Overrides: []Override{
 			{
-				WebhookURL: "http://example.com",
-				Group:      "group",
+				Config: Config{WebhookURL: "http://example.com"},
+				Group:  "group",
 			},
 		},
 	}
-	if !providerWithValidOverride.IsValid() {
+	if err := providerWithValidOverride.Validate(); err != nil {
 		t.Error("provider should've been valid")
 	}
 }
@@ -74,7 +76,7 @@ func TestAlertProvider_Send(t *testing.T) {
 	}{
 		{
 			Name:     "triggered",
-			Provider: AlertProvider{},
+			Provider: AlertProvider{DefaultConfig: Config{WebhookURL: "http://example.com"}},
 			Alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved: false,
 			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
@@ -84,7 +86,7 @@ func TestAlertProvider_Send(t *testing.T) {
 		},
 		{
 			Name:     "triggered-error",
-			Provider: AlertProvider{},
+			Provider: AlertProvider{DefaultConfig: Config{WebhookURL: "http://example.com"}},
 			Alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved: false,
 			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
@@ -94,7 +96,7 @@ func TestAlertProvider_Send(t *testing.T) {
 		},
 		{
 			Name:     "resolved",
-			Provider: AlertProvider{},
+			Provider: AlertProvider{DefaultConfig: Config{WebhookURL: "http://example.com"}},
 			Alert:    alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved: true,
 			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
@@ -104,7 +106,7 @@ func TestAlertProvider_Send(t *testing.T) {
 		},
 		{
 			Name:     "resolved-error",
-			Provider: AlertProvider{},
+			Provider: AlertProvider{DefaultConfig: Config{WebhookURL: "http://example.com"}},
 			Alert:    alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved: true,
 			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
@@ -114,7 +116,27 @@ func TestAlertProvider_Send(t *testing.T) {
 		},
 		{
 			Name:     "triggered-with-modified-title",
-			Provider: AlertProvider{Title: title},
+			Provider: AlertProvider{DefaultConfig: Config{WebhookURL: "http://example.com", Title: title}},
+			Alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved: false,
+			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
+				return &http.Response{StatusCode: http.StatusOK, Body: http.NoBody}
+			}),
+			ExpectedError: false,
+		},
+		{
+			Name:     "triggered-with-webhook-override",
+			Provider: AlertProvider{DefaultConfig: Config{WebhookURL: "http://example.com"}},
+			Alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3, ProviderOverride: map[string]any{"webhook-url": "http://example01.com"}},
+			Resolved: false,
+			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
+				return &http.Response{StatusCode: http.StatusOK, Body: http.NoBody}
+			}),
+			ExpectedError: false,
+		},
+		{
+			Name:     "triggered-with-message-content",
+			Provider: AlertProvider{DefaultConfig: Config{WebhookURL: "http://example.com", MessageContent: "<@123456789>"}},
 			Alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved: false,
 			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
@@ -175,7 +197,7 @@ func TestAlertProvider_buildRequestBody(t *testing.T) {
 		},
 		{
 			Name:         "triggered-with-modified-title",
-			Provider:     AlertProvider{Title: title},
+			Provider:     AlertProvider{DefaultConfig: Config{Title: title}},
 			Alert:        alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved:     false,
 			ExpectedBody: "{\"content\":\"\",\"embeds\":[{\"title\":\"provider-title\",\"description\":\"An alert for **endpoint-name** has been triggered due to having failed 3 time(s) in a row:\\n\\u003e description-1\",\"color\":15158332,\"fields\":[{\"name\":\"Condition results\",\"value\":\":x: - `[CONNECTED] == true`\\n:x: - `[STATUS] == 200`\\n:x: - `[BODY] != \\\"\\\"`\\n\",\"inline\":false}]}]}",
@@ -183,11 +205,32 @@ func TestAlertProvider_buildRequestBody(t *testing.T) {
 		{
 			Name:         "triggered-with-no-conditions",
 			NoConditions: true,
-			Provider:     AlertProvider{Title: title},
+			Provider:     AlertProvider{DefaultConfig: Config{Title: title}},
 			Alert:        alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved:     false,
 			ExpectedBody: "{\"content\":\"\",\"embeds\":[{\"title\":\"provider-title\",\"description\":\"An alert for **endpoint-name** has been triggered due to having failed 3 time(s) in a row:\\n\\u003e description-1\",\"color\":15158332}]}",
 		},
+		{
+			Name:         "triggered-with-message-content-user-mention",
+			Provider:     AlertProvider{DefaultConfig: Config{MessageContent: "<@123456789>"}},
+			Alert:        alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved:     false,
+			ExpectedBody: "{\"content\":\"\\u003c@123456789\\u003e\",\"embeds\":[{\"title\":\":helmet_with_white_cross: Gatus\",\"description\":\"An alert for **endpoint-name** has been triggered due to having failed 3 time(s) in a row:\\n\\u003e description-1\",\"color\":15158332,\"fields\":[{\"name\":\"Condition results\",\"value\":\":x: - `[CONNECTED] == true`\\n:x: - `[STATUS] == 200`\\n:x: - `[BODY] != \\\"\\\"`\\n\",\"inline\":false}]}]}",
+		},
+		{
+			Name:         "triggered-with-message-content-role-mention",
+			Provider:     AlertProvider{DefaultConfig: Config{MessageContent: "<@&987654321>"}},
+			Alert:        alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved:     false,
+			ExpectedBody: "{\"content\":\"\\u003c@\\u0026987654321\\u003e\",\"embeds\":[{\"title\":\":helmet_with_white_cross: Gatus\",\"description\":\"An alert for **endpoint-name** has been triggered due to having failed 3 time(s) in a row:\\n\\u003e description-1\",\"color\":15158332,\"fields\":[{\"name\":\"Condition results\",\"value\":\":x: - `[CONNECTED] == true`\\n:x: - `[STATUS] == 200`\\n:x: - `[BODY] != \\\"\\\"`\\n\",\"inline\":false}]}]}",
+		},
+		{
+			Name:         "resolved-with-message-content",
+			Provider:     AlertProvider{DefaultConfig: Config{MessageContent: "<@123456789>"}},
+			Alert:        alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved:     true,
+			ExpectedBody: "{\"content\":\"\\u003c@123456789\\u003e\",\"embeds\":[{\"title\":\":helmet_with_white_cross: Gatus\",\"description\":\"An alert for **endpoint-name** has been resolved after passing successfully 5 time(s) in a row:\\n\\u003e description-2\",\"color\":3066993,\"fields\":[{\"name\":\"Condition results\",\"value\":\":white_check_mark: - `[CONNECTED] == true`\\n:white_check_mark: - `[STATUS] == 200`\\n:white_check_mark: - `[BODY] != \\\"\\\"`\\n\",\"inline\":false}]}]}",
+		},
 	}
 	for _, scenario := range scenarios {
 		t.Run(scenario.Name, func(t *testing.T) {
@@ -200,6 +243,7 @@ func TestAlertProvider_buildRequestBody(t *testing.T) {
 				}
 			}
 			body := scenario.Provider.buildRequestBody(
+				&scenario.Provider.DefaultConfig,
 				&endpoint.Endpoint{Name: "endpoint-name"},
 				&scenario.Alert,
 				&endpoint.Result{
@@ -227,64 +271,128 @@ func TestAlertProvider_GetDefaultAlert(t *testing.T) {
 	}
 }
 
-func TestAlertProvider_getWebhookURLForGroup(t *testing.T) {
-	tests := []struct {
+func TestAlertProvider_GetConfig(t *testing.T) {
+	scenarios := []struct {
 		Name           string
 		Provider       AlertProvider
 		InputGroup     string
-		ExpectedOutput string
+		InputAlert     alert.Alert
+		ExpectedOutput Config
 	}{
 		{
 			Name: "provider-no-override-specify-no-group-should-default",
 			Provider: AlertProvider{
-				WebhookURL: "http://example.com",
-				Overrides:  nil,
+				DefaultConfig: Config{WebhookURL: "http://example.com"},
+				Overrides:     nil,
 			},
 			InputGroup:     "",
-			ExpectedOutput: "http://example.com",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{WebhookURL: "http://example.com"},
 		},
 		{
 			Name: "provider-no-override-specify-group-should-default",
 			Provider: AlertProvider{
-				WebhookURL: "http://example.com",
-				Overrides:  nil,
+				DefaultConfig: Config{WebhookURL: "http://example.com"},
+				Overrides:     nil,
 			},
 			InputGroup:     "group",
-			ExpectedOutput: "http://example.com",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{WebhookURL: "http://example.com"},
 		},
 		{
 			Name: "provider-with-override-specify-no-group-should-default",
 			Provider: AlertProvider{
-				WebhookURL: "http://example.com",
+				DefaultConfig: Config{WebhookURL: "http://example.com"},
 				Overrides: []Override{
 					{
-						Group:      "group",
-						WebhookURL: "http://example01.com",
+						Group:  "group",
+						Config: Config{WebhookURL: "http://group-example.com"},
 					},
 				},
 			},
 			InputGroup:     "",
-			ExpectedOutput: "http://example.com",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{WebhookURL: "http://example.com"},
 		},
 		{
 			Name: "provider-with-override-specify-group-should-override",
 			Provider: AlertProvider{
-				WebhookURL: "http://example.com",
+				DefaultConfig: Config{WebhookURL: "http://example.com"},
 				Overrides: []Override{
 					{
-						Group:      "group",
-						WebhookURL: "http://example01.com",
+						Group:  "group",
+						Config: Config{WebhookURL: "http://group-example.com"},
 					},
 				},
 			},
 			InputGroup:     "group",
-			ExpectedOutput: "http://example01.com",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{WebhookURL: "http://group-example.com"},
+		},
+		{
+			Name: "provider-with-group-override-and-alert-override--alert-override-should-take-precedence",
+			Provider: AlertProvider{
+				DefaultConfig: Config{WebhookURL: "http://example.com"},
+				Overrides: []Override{
+					{
+						Group:  "group",
+						Config: Config{WebhookURL: "http://group-example.com"},
+					},
+				},
+			},
+			InputGroup:     "group",
+			InputAlert:     alert.Alert{ProviderOverride: map[string]any{"webhook-url": "http://alert-example.com"}},
+			ExpectedOutput: Config{WebhookURL: "http://alert-example.com"},
+		},
+		{
+			Name: "provider-with-message-content-default",
+			Provider: AlertProvider{
+				DefaultConfig: Config{WebhookURL: "http://example.com", MessageContent: "<@123456789>"},
+			},
+			InputGroup:     "",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{WebhookURL: "http://example.com", MessageContent: "<@123456789>"},
+		},
+		{
+			Name: "provider-with-message-content-group-override",
+			Provider: AlertProvider{
+				DefaultConfig: Config{WebhookURL: "http://example.com", MessageContent: "<@123456789>"},
+				Overrides: []Override{
+					{
+						Group:  "group",
+						Config: Config{WebhookURL: "http://group-example.com", MessageContent: "<@&987654321>"},
+					},
+				},
+			},
+			InputGroup:     "group",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{WebhookURL: "http://group-example.com", MessageContent: "<@&987654321>"},
+		},
+		{
+			Name: "provider-with-message-content-alert-override",
+			Provider: AlertProvider{
+				DefaultConfig: Config{WebhookURL: "http://example.com", MessageContent: "<@123456789>"},
+			},
+			InputGroup:     "",
+			InputAlert:     alert.Alert{ProviderOverride: map[string]any{"message-content": "<@999999999>"}},
+			ExpectedOutput: Config{WebhookURL: "http://example.com", MessageContent: "<@999999999>"},
 		},
 	}
-	for _, tt := range tests {
-		t.Run(tt.Name, func(t *testing.T) {
-			if got := tt.Provider.getWebhookURLForGroup(tt.InputGroup); got != tt.ExpectedOutput {
-				t.Errorf("AlertProvider.getWebhookURLForGroup() = %v, want %v", got, tt.ExpectedOutput)
+	for _, scenario := range scenarios {
+		t.Run(scenario.Name, func(t *testing.T) {
+			got, err := scenario.Provider.GetConfig(scenario.InputGroup, &scenario.InputAlert)
+			if err != nil {
+				t.Fatalf("unexpected error: %s", err)
+			}
+			if got.WebhookURL != scenario.ExpectedOutput.WebhookURL {
+				t.Errorf("expected webhook URL to be %s, got %s", scenario.ExpectedOutput.WebhookURL, got.WebhookURL)
+			}
+			if got.MessageContent != scenario.ExpectedOutput.MessageContent {
+				t.Errorf("expected message content to be %s, got %s", scenario.ExpectedOutput.MessageContent, got.MessageContent)
+			}
+			// Test ValidateOverrides as well, since it really just calls GetConfig
+			if err = scenario.Provider.ValidateOverrides(scenario.InputGroup, &scenario.InputAlert); err != nil {
+				t.Errorf("unexpected error: %s", err)
 			}
 		})
 	}

alerting/provider/email/email.go

@@ -2,6 +2,7 @@ package email
 
 import (
 	"crypto/tls"
+	"errors"
 	"fmt"
 	"math"
 	"strings"
@@ -10,10 +11,17 @@ import (
 	"github.com/TwiN/gatus/v5/client"
 	"github.com/TwiN/gatus/v5/config/endpoint"
 	gomail "gopkg.in/mail.v2"
+	"gopkg.in/yaml.v3"
 )
 
-// AlertProvider is the configuration necessary for sending an alert using SMTP
-type AlertProvider struct {
+var (
+	ErrDuplicateGroupOverride = errors.New("duplicate group override")
+	ErrMissingFromOrToFields  = errors.New("from and to fields are required")
+	ErrInvalidPort            = errors.New("port must be between 1 and 65535 inclusively")
+	ErrMissingHost            = errors.New("host is required")
+)
+
+type Config struct {
 	From     string `yaml:"from"`
 	Username string `yaml:"username"`
 	Password string `yaml:"password"`
@@ -23,6 +31,48 @@ type AlertProvider struct {
 
 	// ClientConfig is the configuration of the client used to communicate with the provider's target
 	ClientConfig *client.Config `yaml:"client,omitempty"`
+}
+
+func (cfg *Config) Validate() error {
+	if len(cfg.From) == 0 || len(cfg.To) == 0 {
+		return ErrMissingFromOrToFields
+	}
+	if cfg.Port < 1 || cfg.Port > math.MaxUint16 {
+		return ErrInvalidPort
+	}
+	if len(cfg.Host) == 0 {
+		return ErrMissingHost
+	}
+	return nil
+}
+
+func (cfg *Config) Merge(override *Config) {
+	if override.ClientConfig != nil {
+		cfg.ClientConfig = override.ClientConfig
+	}
+	if len(override.From) > 0 {
+		cfg.From = override.From
+	}
+	if len(override.Username) > 0 {
+		cfg.Username = override.Username
+	}
+	if len(override.Password) > 0 {
+		cfg.Password = override.Password
+	}
+	if len(override.Host) > 0 {
+		cfg.Host = override.Host
+	}
+	if override.Port > 0 {
+		cfg.Port = override.Port
+	}
+	if len(override.To) > 0 {
+		cfg.To = override.To
+	}
+}
+
+// AlertProvider is the configuration necessary for sending an alert using SMTP
+type AlertProvider struct {
+	DefaultConfig Config `yaml:",inline"`
 
 	// DefaultAlert is the default alert configuration to use for endpoints with an alert of the appropriate type
 	DefaultAlert *alert.Alert `yaml:"default-alert,omitempty"`
@@ -33,54 +83,57 @@ type AlertProvider struct {
 
 // Override is a case under which the default integration is overridden
 type Override struct {
-	Group string `yaml:"group"`
-	To    string `yaml:"to"`
+	Group  string `yaml:"group"`
+	Config `yaml:",inline"`
 }
 
-// IsValid returns whether the provider's configuration is valid
-func (provider *AlertProvider) IsValid() bool {
+// Validate the provider's configuration
+func (provider *AlertProvider) Validate() error {
 	registeredGroups := make(map[string]bool)
 	if provider.Overrides != nil {
 		for _, override := range provider.Overrides {
 			if isAlreadyRegistered := registeredGroups[override.Group]; isAlreadyRegistered || override.Group == "" || len(override.To) == 0 {
-				return false
+				return ErrDuplicateGroupOverride
 			}
 			registeredGroups[override.Group] = true
 		}
 	}
-
-	return len(provider.From) > 0 && len(provider.Host) > 0 && len(provider.To) > 0 && provider.Port > 0 && provider.Port < math.MaxUint16
+	return provider.DefaultConfig.Validate()
 }
 
 // Send an alert using the provider
 func (provider *AlertProvider) Send(ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) error {
+	cfg, err := provider.GetConfig(ep.Group, alert)
+	if err != nil {
+		return err
+	}
 	var username string
-	if len(provider.Username) > 0 {
-		username = provider.Username
+	if len(cfg.Username) > 0 {
+		username = cfg.Username
 	} else {
-		username = provider.From
+		username = cfg.From
 	}
 	subject, body := provider.buildMessageSubjectAndBody(ep, alert, result, resolved)
 	m := gomail.NewMessage()
-	m.SetHeader("From", provider.From)
-	m.SetHeader("To", strings.Split(provider.getToForGroup(ep.Group), ",")...)
+	m.SetHeader("From", cfg.From)
+	m.SetHeader("To", strings.Split(cfg.To, ",")...)
 	m.SetHeader("Subject", subject)
 	m.SetBody("text/plain", body)
 	var d *gomail.Dialer
-	if len(provider.Password) == 0 {
+	if len(cfg.Password) == 0 {
 		// Get the domain in the From address
 		localName := "localhost"
-		fromParts := strings.Split(provider.From, `@`)
+		fromParts := strings.Split(cfg.From, `@`)
 		if len(fromParts) == 2 {
 			localName = fromParts[1]
 		}
 		// Create a dialer with no authentication
-		d = &gomail.Dialer{Host: provider.Host, Port: provider.Port, LocalName: localName}
+		d = &gomail.Dialer{Host: cfg.Host, Port: cfg.Port, LocalName: localName}
 	} else {
 		// Create an authenticated dialer
-		d = gomail.NewDialer(provider.Host, provider.Port, username, provider.Password)
+		d = gomail.NewDialer(cfg.Host, cfg.Port, username, cfg.Password)
 	}
-	if provider.ClientConfig != nil && provider.ClientConfig.Insecure {
+	if cfg.ClientConfig != nil && cfg.ClientConfig.Insecure {
 		d.TLSConfig = &tls.Config{InsecureSkipVerify: true}
 	}
 	return d.DialAndSend(m)
@@ -113,22 +166,48 @@ func (provider *AlertProvider) buildMessageSubjectAndBody(ep *endpoint.Endpoint,
 	if alertDescription := alert.GetDescription(); len(alertDescription) > 0 {
 		description = "\n\nAlert description: " + alertDescription
 	}
-	return subject, message + description + formattedConditionResults
-}
-
-// getToForGroup returns the appropriate email integration to for a given group
-func (provider *AlertProvider) getToForGroup(group string) string {
-	if provider.Overrides != nil {
-		for _, override := range provider.Overrides {
-			if group == override.Group {
-				return override.To
-			}
+	var extraLabels string
+	if len(ep.ExtraLabels) > 0 {
+		extraLabels = "\n\nExtra labels:\n"
+		for key, value := range ep.ExtraLabels {
+			extraLabels += fmt.Sprintf("  %s: %s\n", key, value)
 		}
 	}
-	return provider.To
+	return subject, message + description + extraLabels + formattedConditionResults
 }
 
 // GetDefaultAlert returns the provider's default alert configuration
 func (provider *AlertProvider) GetDefaultAlert() *alert.Alert {
 	return provider.DefaultAlert
 }
+
+// GetConfig returns the configuration for the provider with the overrides applied
+func (provider *AlertProvider) GetConfig(group string, alert *alert.Alert) (*Config, error) {
+	cfg := provider.DefaultConfig
+	// Handle group overrides
+	if provider.Overrides != nil {
+		for _, override := range provider.Overrides {
+			if group == override.Group {
+				cfg.Merge(&override.Config)
+				break
+			}
+		}
+	}
+	// Handle alert overrides
+	if len(alert.ProviderOverride) != 0 {
+		overrideConfig := Config{}
+		if err := yaml.Unmarshal(alert.ProviderOverrideAsBytes(), &overrideConfig); err != nil {
+			return nil, err
+		}
+		cfg.Merge(&overrideConfig)
+	}
+	// Validate the configuration
+	err := cfg.Validate()
+	return &cfg, err
+}
+
+// ValidateOverrides validates the alert's provider override and, if present, the group override
+func (provider *AlertProvider) ValidateOverrides(group string, alert *alert.Alert) error {
+	_, err := provider.GetConfig(group, alert)
+	return err
+}

alerting/provider/email/email_test.go

@@ -7,61 +7,63 @@ import (
 	"github.com/TwiN/gatus/v5/config/endpoint"
 )
 
-func TestAlertDefaultProvider_IsValid(t *testing.T) {
+func TestAlertProvider_Validate(t *testing.T) {
 	invalidProvider := AlertProvider{}
-	if invalidProvider.IsValid() {
+	if err := invalidProvider.Validate(); err == nil {
 		t.Error("provider shouldn't have been valid")
 	}
-	validProvider := AlertProvider{From: "from@example.com", Password: "password", Host: "smtp.gmail.com", Port: 587, To: "to@example.com"}
-	if !validProvider.IsValid() {
+	validProvider := AlertProvider{DefaultConfig: Config{From: "from@example.com", Password: "password", Host: "smtp.gmail.com", Port: 587, To: "to@example.com"}}
+	if err := validProvider.Validate(); err != nil {
 		t.Error("provider should've been valid")
 	}
 }
 
-func TestAlertProvider_IsValidWithNoCredentials(t *testing.T) {
-	validProvider := AlertProvider{From: "from@example.com", Host: "smtp-relay.gmail.com", Port: 587, To: "to@example.com"}
-	if !validProvider.IsValid() {
+func TestAlertProvider_ValidateWithNoCredentials(t *testing.T) {
+	validProvider := AlertProvider{DefaultConfig: Config{From: "from@example.com", Host: "smtp-relay.gmail.com", Port: 587, To: "to@example.com"}}
+	if err := validProvider.Validate(); err != nil {
 		t.Error("provider should've been valid")
 	}
 }
 
-func TestAlertProvider_IsValidWithOverride(t *testing.T) {
+func TestAlertProvider_ValidateWithOverride(t *testing.T) {
 	providerWithInvalidOverrideGroup := AlertProvider{
 		Overrides: []Override{
 			{
-				To:    "to@example.com",
-				Group: "",
+				Config: Config{To: "to@example.com"},
+				Group:  "",
 			},
 		},
 	}
-	if providerWithInvalidOverrideGroup.IsValid() {
+	if err := providerWithInvalidOverrideGroup.Validate(); err == nil {
 		t.Error("provider Group shouldn't have been valid")
 	}
 	providerWithInvalidOverrideTo := AlertProvider{
 		Overrides: []Override{
 			{
-				To:    "",
-				Group: "group",
+				Config: Config{To: ""},
+				Group:  "group",
 			},
 		},
 	}
-	if providerWithInvalidOverrideTo.IsValid() {
+	if err := providerWithInvalidOverrideTo.Validate(); err == nil {
 		t.Error("provider integration key shouldn't have been valid")
 	}
 	providerWithValidOverride := AlertProvider{
-		From:     "from@example.com",
-		Password: "password",
-		Host:     "smtp.gmail.com",
-		Port:     587,
-		To:       "to@example.com",
+		DefaultConfig: Config{
+			From:     "from@example.com",
+			Password: "password",
+			Host:     "smtp.gmail.com",
+			Port:     587,
+			To:       "to@example.com",
+		},
 		Overrides: []Override{
 			{
-				To:    "to@example.com",
-				Group: "group",
+				Config: Config{To: "to@example.com"},
+				Group:  "group",
 			},
 		},
 	}
-	if !providerWithValidOverride.IsValid() {
+	if err := providerWithValidOverride.Validate(); err != nil {
 		t.Error("provider should've been valid")
 	}
 }
@@ -74,6 +76,7 @@ func TestAlertProvider_buildRequestBody(t *testing.T) {
 		Provider        AlertProvider
 		Alert           alert.Alert
 		Resolved        bool
+		Endpoint        *endpoint.Endpoint
 		ExpectedSubject string
 		ExpectedBody    string
 	}{
@@ -82,6 +85,7 @@ func TestAlertProvider_buildRequestBody(t *testing.T) {
 			Provider:        AlertProvider{},
 			Alert:           alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved:        false,
+			Endpoint:        &endpoint.Endpoint{Name: "endpoint-name"},
 			ExpectedSubject: "[endpoint-name] Alert triggered",
 			ExpectedBody:    "An alert for endpoint-name has been triggered due to having failed 3 time(s) in a row\n\nAlert description: description-1\n\nCondition results:\n❌ [CONNECTED] == true\n❌ [STATUS] == 200\n",
 		},
@@ -90,14 +94,42 @@ func TestAlertProvider_buildRequestBody(t *testing.T) {
 			Provider:        AlertProvider{},
 			Alert:           alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved:        true,
+			Endpoint:        &endpoint.Endpoint{Name: "endpoint-name"},
 			ExpectedSubject: "[endpoint-name] Alert resolved",
 			ExpectedBody:    "An alert for endpoint-name has been resolved after passing successfully 5 time(s) in a row\n\nAlert description: description-2\n\nCondition results:\n✅ [CONNECTED] == true\n✅ [STATUS] == 200\n",
 		},
+		{
+			Name:            "triggered-with-single-extra-label",
+			Provider:        AlertProvider{},
+			Alert:           alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved:        false,
+			Endpoint:        &endpoint.Endpoint{Name: "endpoint-name", ExtraLabels: map[string]string{"environment": "production"}},
+			ExpectedSubject: "[endpoint-name] Alert triggered",
+			ExpectedBody:    "An alert for endpoint-name has been triggered due to having failed 3 time(s) in a row\n\nAlert description: description-1\n\nExtra labels:\n  environment: production\n\n\nCondition results:\n❌ [CONNECTED] == true\n❌ [STATUS] == 200\n",
+		},
+		{
+			Name:            "resolved-with-single-extra-label",
+			Provider:        AlertProvider{},
+			Alert:           alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved:        true,
+			Endpoint:        &endpoint.Endpoint{Name: "endpoint-name", ExtraLabels: map[string]string{"service": "api"}},
+			ExpectedSubject: "[endpoint-name] Alert resolved",
+			ExpectedBody:    "An alert for endpoint-name has been resolved after passing successfully 5 time(s) in a row\n\nAlert description: description-2\n\nExtra labels:\n  service: api\n\n\nCondition results:\n✅ [CONNECTED] == true\n✅ [STATUS] == 200\n",
+		},
+		{
+			Name:            "triggered-with-no-extra-labels",
+			Provider:        AlertProvider{},
+			Alert:           alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved:        false,
+			Endpoint:        &endpoint.Endpoint{Name: "endpoint-name", ExtraLabels: map[string]string{}},
+			ExpectedSubject: "[endpoint-name] Alert triggered",
+			ExpectedBody:    "An alert for endpoint-name has been triggered due to having failed 3 time(s) in a row\n\nAlert description: description-1\n\nCondition results:\n❌ [CONNECTED] == true\n❌ [STATUS] == 200\n",
+		},
 	}
 	for _, scenario := range scenarios {
 		t.Run(scenario.Name, func(t *testing.T) {
 			subject, body := scenario.Provider.buildMessageSubjectAndBody(
-				&endpoint.Endpoint{Name: "endpoint-name"},
+				scenario.Endpoint,
 				&scenario.Alert,
 				&endpoint.Result{
 					ConditionResults: []*endpoint.ConditionResult{
@@ -126,64 +158,104 @@ func TestAlertProvider_GetDefaultAlert(t *testing.T) {
 	}
 }
 
-func TestAlertProvider_getToForGroup(t *testing.T) {
-	tests := []struct {
+func TestAlertProvider_GetConfig(t *testing.T) {
+	scenarios := []struct {
 		Name           string
 		Provider       AlertProvider
 		InputGroup     string
-		ExpectedOutput string
+		InputAlert     alert.Alert
+		ExpectedOutput Config
 	}{
 		{
 			Name: "provider-no-override-specify-no-group-should-default",
 			Provider: AlertProvider{
-				To:        "to@example.com",
-				Overrides: nil,
+				DefaultConfig: Config{From: "from@example.com", To: "to@example.com", Host: "smtp.gmail.com", Port: 587, Password: "password"},
+				Overrides:     nil,
 			},
 			InputGroup:     "",
-			ExpectedOutput: "to@example.com",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{From: "from@example.com", To: "to@example.com", Host: "smtp.gmail.com", Port: 587, Password: "password"},
 		},
 		{
 			Name: "provider-no-override-specify-group-should-default",
 			Provider: AlertProvider{
-				To:        "to@example.com",
-				Overrides: nil,
+				DefaultConfig: Config{From: "from@example.com", To: "to@example.com", Host: "smtp.gmail.com", Port: 587, Password: "password"},
+				Overrides:     nil,
 			},
 			InputGroup:     "group",
-			ExpectedOutput: "to@example.com",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{From: "from@example.com", To: "to@example.com", Host: "smtp.gmail.com", Port: 587, Password: "password"},
 		},
 		{
 			Name: "provider-with-override-specify-no-group-should-default",
 			Provider: AlertProvider{
-				To: "to@example.com",
+				DefaultConfig: Config{From: "from@example.com", To: "to@example.com", Host: "smtp.gmail.com", Port: 587, Password: "password"},
 				Overrides: []Override{
 					{
-						Group: "group",
-						To:    "to01@example.com",
+						Group:  "group",
+						Config: Config{To: "to01@example.com"},
 					},
 				},
 			},
 			InputGroup:     "",
-			ExpectedOutput: "to@example.com",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{From: "from@example.com", To: "to@example.com", Host: "smtp.gmail.com", Port: 587, Password: "password"},
 		},
 		{
 			Name: "provider-with-override-specify-group-should-override",
 			Provider: AlertProvider{
-				To: "to@example.com",
+				DefaultConfig: Config{From: "from@example.com", To: "to@example.com", Host: "smtp.gmail.com", Port: 587, Password: "password"},
 				Overrides: []Override{
 					{
-						Group: "group",
-						To:    "to01@example.com",
+						Group:  "group",
+						Config: Config{To: "group-to@example.com"},
 					},
 				},
 			},
 			InputGroup:     "group",
-			ExpectedOutput: "to01@example.com",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{From: "from@example.com", To: "group-to@example.com", Host: "smtp.gmail.com", Port: 587, Password: "password"},
+		},
+		{
+			Name: "provider-with-group-override-and-alert-override--alert-override-should-take-precedence",
+			Provider: AlertProvider{
+				DefaultConfig: Config{From: "from@example.com", To: "to@example.com", Host: "smtp.gmail.com", Port: 587, Password: "password"},
+				Overrides: []Override{
+					{
+						Group:  "group",
+						Config: Config{To: "group-to@example.com"},
+					},
+				},
+			},
+			InputGroup:     "group",
+			InputAlert:     alert.Alert{ProviderOverride: map[string]any{"to": "alert-to@example.com", "host": "smtp.example.com", "port": 588, "password": "hunter2"}},
+			ExpectedOutput: Config{From: "from@example.com", To: "alert-to@example.com", Host: "smtp.example.com", Port: 588, Password: "hunter2"},
 		},
 	}
-	for _, tt := range tests {
-		t.Run(tt.Name, func(t *testing.T) {
-			if got := tt.Provider.getToForGroup(tt.InputGroup); got != tt.ExpectedOutput {
-				t.Errorf("AlertProvider.getToForGroup() = %v, want %v", got, tt.ExpectedOutput)
+	for _, scenario := range scenarios {
+		t.Run(scenario.Name, func(t *testing.T) {
+			got, err := scenario.Provider.GetConfig(scenario.InputGroup, &scenario.InputAlert)
+			if err != nil {
+				t.Fatalf("unexpected error: %s", err)
+			}
+			if got.From != scenario.ExpectedOutput.From {
+				t.Errorf("expected from to be %s, got %s", scenario.ExpectedOutput.From, got.From)
+			}
+			if got.To != scenario.ExpectedOutput.To {
+				t.Errorf("expected to be %s, got %s", scenario.ExpectedOutput.To, got.To)
+			}
+			if got.Host != scenario.ExpectedOutput.Host {
+				t.Errorf("expected host to be %s, got %s", scenario.ExpectedOutput.Host, got.Host)
+			}
+			if got.Port != scenario.ExpectedOutput.Port {
+				t.Errorf("expected port to be %d, got %d", scenario.ExpectedOutput.Port, got.Port)
+			}
+			if got.Password != scenario.ExpectedOutput.Password {
+				t.Errorf("expected password to be %s, got %s", scenario.ExpectedOutput.Password, got.Password)
+			}
+			// Test ValidateOverrides as well, since it really just calls GetConfig
+			if err = scenario.Provider.ValidateOverrides(scenario.InputGroup, &scenario.InputAlert); err != nil {
+				t.Errorf("unexpected error: %s", err)
 			}
 		})
 	}

alerting/provider/gitea/gitea.go

@@ -0,0 +1,217 @@
+package gitea
+
+import (
+	"crypto/tls"
+	"errors"
+	"fmt"
+	"net/http"
+	"net/url"
+	"strings"
+
+	"code.gitea.io/sdk/gitea"
+	"github.com/TwiN/gatus/v5/alerting/alert"
+	"github.com/TwiN/gatus/v5/client"
+	"github.com/TwiN/gatus/v5/config/endpoint"
+	"gopkg.in/yaml.v3"
+)
+
+var (
+	ErrRepositoryURLNotSet  = errors.New("repository-url not set")
+	ErrInvalidRepositoryURL = errors.New("invalid repository-url")
+	ErrTokenNotSet          = errors.New("token not set")
+)
+
+type Config struct {
+	RepositoryURL string   `yaml:"repository-url"`      // The URL of the Gitea repository to create issues in
+	Token         string   `yaml:"token"`               // Token requires at least RW on issues and RO on metadata
+	Assignees     []string `yaml:"assignees,omitempty"` // Assignees is a list of users to assign the issue to
+
+	username        string
+	repositoryOwner string
+	repositoryName  string
+	giteaClient     *gitea.Client
+
+	// ClientConfig is the configuration of the client used to communicate with the provider's target
+	ClientConfig *client.Config `yaml:"client,omitempty"`
+}
+
+func (cfg *Config) Validate() error {
+	if len(cfg.RepositoryURL) == 0 {
+		return ErrRepositoryURLNotSet
+	}
+	if len(cfg.Token) == 0 {
+		return ErrTokenNotSet
+	}
+	// Validate format of the repository URL
+	repositoryURL, err := url.Parse(cfg.RepositoryURL)
+	if err != nil {
+		return err
+	}
+	baseURL := repositoryURL.Scheme + "://" + repositoryURL.Host
+	pathParts := strings.Split(repositoryURL.Path, "/")
+	if len(pathParts) != 3 {
+		return ErrInvalidRepositoryURL
+	}
+	if cfg.repositoryOwner == pathParts[1] && cfg.repositoryName == pathParts[2] && cfg.giteaClient != nil {
+		// Already validated, let's skip the rest of the validation to avoid unnecessary API calls
+		return nil
+	}
+	cfg.repositoryOwner = pathParts[1]
+	cfg.repositoryName = pathParts[2]
+	opts := []gitea.ClientOption{
+		gitea.SetToken(cfg.Token),
+	}
+	if cfg.ClientConfig != nil && cfg.ClientConfig.Insecure {
+		// add new http client for skip verify
+		httpClient := &http.Client{
+			Transport: &http.Transport{
+				TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
+			},
+		}
+		opts = append(opts, gitea.SetHTTPClient(httpClient))
+	}
+	cfg.giteaClient, err = gitea.NewClient(baseURL, opts...)
+	if err != nil {
+		return err
+	}
+	user, _, err := cfg.giteaClient.GetMyUserInfo()
+	if err != nil {
+		return err
+	}
+	cfg.username = user.UserName
+	return nil
+}
+
+func (cfg *Config) Merge(override *Config) {
+	if override.ClientConfig != nil {
+		cfg.ClientConfig = override.ClientConfig
+	}
+	if len(override.RepositoryURL) > 0 {
+		cfg.RepositoryURL = override.RepositoryURL
+	}
+	if len(override.Token) > 0 {
+		cfg.Token = override.Token
+	}
+	if len(override.Assignees) > 0 {
+		cfg.Assignees = override.Assignees
+	}
+}
+
+// AlertProvider is the configuration necessary for sending an alert using Discord
+type AlertProvider struct {
+	DefaultConfig Config `yaml:",inline"`
+
+	// DefaultAlert is the default alert configuration to use for endpoints with an alert of the appropriate type
+	DefaultAlert *alert.Alert `yaml:"default-alert,omitempty"`
+}
+
+// Validate the provider's configuration
+func (provider *AlertProvider) Validate() error {
+	return provider.DefaultConfig.Validate()
+}
+
+// Send creates an issue in the designed RepositoryURL if the resolved parameter passed is false,
+// or closes the relevant issue(s) if the resolved parameter passed is true.
+func (provider *AlertProvider) Send(ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) error {
+	cfg, err := provider.GetConfig(ep.Group, alert)
+	if err != nil {
+		return err
+	}
+	title := "alert(gatus): " + ep.DisplayName()
+	if !resolved {
+		_, _, err = cfg.giteaClient.CreateIssue(
+			cfg.repositoryOwner,
+			cfg.repositoryName,
+			gitea.CreateIssueOption{
+				Title:     title,
+				Body:      provider.buildIssueBody(ep, alert, result),
+				Assignees: cfg.Assignees,
+			},
+		)
+		if err != nil {
+			return fmt.Errorf("failed to create issue: %w", err)
+		}
+		return nil
+	}
+	issues, _, err := cfg.giteaClient.ListRepoIssues(
+		cfg.repositoryOwner,
+		cfg.repositoryName,
+		gitea.ListIssueOption{
+			State:     gitea.StateOpen,
+			CreatedBy: cfg.username,
+			ListOptions: gitea.ListOptions{
+				PageSize: 100,
+			},
+		},
+	)
+	if err != nil {
+		return fmt.Errorf("failed to list issues: %w", err)
+	}
+	for _, issue := range issues {
+		if issue.Title == title {
+			stateClosed := gitea.StateClosed
+			_, _, err = cfg.giteaClient.EditIssue(
+				cfg.repositoryOwner,
+				cfg.repositoryName,
+				issue.Index,
+				gitea.EditIssueOption{
+					State: &stateClosed,
+				},
+			)
+			if err != nil {
+				return fmt.Errorf("failed to close issue: %w", err)
+			}
+		}
+	}
+	return nil
+}
+
+// buildIssueBody builds the body of the issue
+func (provider *AlertProvider) buildIssueBody(ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result) string {
+	var formattedConditionResults string
+	if len(result.ConditionResults) > 0 {
+		formattedConditionResults = "\n\n## Condition results\n"
+		for _, conditionResult := range result.ConditionResults {
+			var prefix string
+			if conditionResult.Success {
+				prefix = ":white_check_mark:"
+			} else {
+				prefix = ":x:"
+			}
+			formattedConditionResults += fmt.Sprintf("- %s - `%s`\n", prefix, conditionResult.Condition)
+		}
+	}
+	var description string
+	if alertDescription := alert.GetDescription(); len(alertDescription) > 0 {
+		description = ":\n> " + alertDescription
+	}
+	message := fmt.Sprintf("An alert for **%s** has been triggered due to having failed %d time(s) in a row", ep.DisplayName(), alert.FailureThreshold)
+	return message + description + formattedConditionResults
+}
+
+// GetDefaultAlert returns the provider's default alert configuration
+func (provider *AlertProvider) GetDefaultAlert() *alert.Alert {
+	return provider.DefaultAlert
+}
+
+// GetConfig returns the configuration for the provider with the overrides applied
+func (provider *AlertProvider) GetConfig(group string, alert *alert.Alert) (*Config, error) {
+	cfg := provider.DefaultConfig
+	// Handle alert overrides
+	if len(alert.ProviderOverride) != 0 {
+		overrideConfig := Config{}
+		if err := yaml.Unmarshal(alert.ProviderOverrideAsBytes(), &overrideConfig); err != nil {
+			return nil, err
+		}
+		cfg.Merge(&overrideConfig)
+	}
+	// Validate the configuration (we're returning the cfg here even if there's an error mostly for testing purposes)
+	err := cfg.Validate()
+	return &cfg, err
+}
+
+// ValidateOverrides validates the alert's provider override and, if present, the group override
+func (provider *AlertProvider) ValidateOverrides(group string, alert *alert.Alert) error {
+	_, err := provider.GetConfig(group, alert)
+	return err
+}

alerting/provider/gitea/gitea_test.go

@@ -0,0 +1,229 @@
+package gitea
+
+import (
+	"net/http"
+	"strings"
+	"testing"
+
+	"code.gitea.io/sdk/gitea"
+	"github.com/TwiN/gatus/v5/alerting/alert"
+	"github.com/TwiN/gatus/v5/client"
+	"github.com/TwiN/gatus/v5/config/endpoint"
+	"github.com/TwiN/gatus/v5/test"
+)
+
+func TestAlertProvider_Validate(t *testing.T) {
+	scenarios := []struct {
+		Name          string
+		Provider      AlertProvider
+		ExpectedError bool
+	}{
+		{
+			Name:          "invalid",
+			Provider:      AlertProvider{DefaultConfig: Config{RepositoryURL: "", Token: ""}},
+			ExpectedError: true,
+		},
+		{
+			Name:          "invalid-token",
+			Provider:      AlertProvider{DefaultConfig: Config{RepositoryURL: "https://gitea.com/TwiN/test", Token: "12345"}},
+			ExpectedError: true,
+		},
+		{
+			Name:          "missing-repository-name",
+			Provider:      AlertProvider{DefaultConfig: Config{RepositoryURL: "https://gitea.com/TwiN", Token: "12345"}},
+			ExpectedError: true,
+		},
+		{
+			Name:          "enterprise-client",
+			Provider:      AlertProvider{DefaultConfig: Config{RepositoryURL: "https://gitea.example.com/TwiN/test", Token: "12345"}},
+			ExpectedError: false,
+		},
+		{
+			Name:          "invalid-url",
+			Provider:      AlertProvider{DefaultConfig: Config{RepositoryURL: "gitea.com/TwiN/test", Token: "12345"}},
+			ExpectedError: true,
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(scenario.Name, func(t *testing.T) {
+			err := scenario.Provider.Validate()
+			if scenario.ExpectedError && err == nil {
+				t.Error("expected error, got none")
+			}
+			if !scenario.ExpectedError && err != nil && !strings.Contains(err.Error(), "user does not exist") && !strings.Contains(err.Error(), "no such host") {
+				t.Error("expected no error, got", err.Error())
+			}
+		})
+	}
+}
+
+func TestAlertProvider_Send(t *testing.T) {
+	defer client.InjectHTTPClient(nil)
+	firstDescription := "description-1"
+	secondDescription := "description-2"
+	scenarios := []struct {
+		Name             string
+		Provider         AlertProvider
+		Alert            alert.Alert
+		Resolved         bool
+		MockRoundTripper test.MockRoundTripper
+		ExpectedError    bool
+	}{
+		{
+			Name:          "triggered-error",
+			Provider:      AlertProvider{DefaultConfig: Config{RepositoryURL: "https://gitea.com/TwiN/test", Token: "12345"}},
+			Alert:         alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved:      false,
+			ExpectedError: true,
+		},
+		{
+			Name:          "resolved-error",
+			Provider:      AlertProvider{DefaultConfig: Config{RepositoryURL: "https://gitea.com/TwiN/test", Token: "12345"}},
+			Alert:         alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved:      true,
+			ExpectedError: true,
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(scenario.Name, func(t *testing.T) {
+			cfg, err := scenario.Provider.GetConfig("", &scenario.Alert)
+			if err != nil && !strings.Contains(err.Error(), "user does not exist") && !strings.Contains(err.Error(), "no such host") {
+				t.Error("expected no error, got", err.Error())
+			}
+			cfg.giteaClient, _ = gitea.NewClient("https://gitea.com")
+			client.InjectHTTPClient(&http.Client{Transport: scenario.MockRoundTripper})
+			err = scenario.Provider.Send(
+				&endpoint.Endpoint{Name: "endpoint-name", Group: "endpoint-group"},
+				&scenario.Alert,
+				&endpoint.Result{
+					ConditionResults: []*endpoint.ConditionResult{
+						{Condition: "[CONNECTED] == true", Success: scenario.Resolved},
+						{Condition: "[STATUS] == 200", Success: scenario.Resolved},
+					},
+				},
+				scenario.Resolved,
+			)
+			if scenario.ExpectedError && err == nil {
+				t.Error("expected error, got none")
+			}
+			if !scenario.ExpectedError && err != nil {
+				t.Error("expected no error, got", err.Error())
+			}
+		})
+	}
+}
+
+func TestAlertProvider_buildRequestBody(t *testing.T) {
+	firstDescription := "description-1"
+	scenarios := []struct {
+		Name         string
+		Endpoint     endpoint.Endpoint
+		Provider     AlertProvider
+		Alert        alert.Alert
+		NoConditions bool
+		ExpectedBody string
+	}{
+		{
+			Name:         "triggered",
+			Endpoint:     endpoint.Endpoint{Name: "endpoint-name", URL: "https://example.org"},
+			Provider:     AlertProvider{},
+			Alert:        alert.Alert{Description: &firstDescription, FailureThreshold: 3},
+			ExpectedBody: "An alert for **endpoint-name** has been triggered due to having failed 3 time(s) in a row:\n> description-1\n\n## Condition results\n- :white_check_mark: - `[CONNECTED] == true`\n- :x: - `[STATUS] == 200`",
+		},
+		{
+			Name:         "triggered-with-no-description",
+			Endpoint:     endpoint.Endpoint{Name: "endpoint-name", URL: "https://example.org"},
+			Provider:     AlertProvider{},
+			Alert:        alert.Alert{FailureThreshold: 10},
+			ExpectedBody: "An alert for **endpoint-name** has been triggered due to having failed 10 time(s) in a row\n\n## Condition results\n- :white_check_mark: - `[CONNECTED] == true`\n- :x: - `[STATUS] == 200`",
+		},
+		{
+			Name:         "triggered-with-no-conditions",
+			NoConditions: true,
+			Endpoint:     endpoint.Endpoint{Name: "endpoint-name", URL: "https://example.org"},
+			Provider:     AlertProvider{},
+			Alert:        alert.Alert{Description: &firstDescription, FailureThreshold: 10},
+			ExpectedBody: "An alert for **endpoint-name** has been triggered due to having failed 10 time(s) in a row:\n> description-1",
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(scenario.Name, func(t *testing.T) {
+			var conditionResults []*endpoint.ConditionResult
+			if !scenario.NoConditions {
+				conditionResults = []*endpoint.ConditionResult{
+					{Condition: "[CONNECTED] == true", Success: true},
+					{Condition: "[STATUS] == 200", Success: false},
+				}
+			}
+			body := scenario.Provider.buildIssueBody(
+				&scenario.Endpoint,
+				&scenario.Alert,
+				&endpoint.Result{ConditionResults: conditionResults},
+			)
+			if strings.TrimSpace(body) != strings.TrimSpace(scenario.ExpectedBody) {
+				t.Errorf("expected:\n%s\ngot:\n%s", scenario.ExpectedBody, body)
+			}
+		})
+	}
+}
+
+func TestAlertProvider_GetDefaultAlert(t *testing.T) {
+	if (&AlertProvider{DefaultAlert: &alert.Alert{}}).GetDefaultAlert() == nil {
+		t.Error("expected default alert to be not nil")
+	}
+	if (&AlertProvider{DefaultAlert: nil}).GetDefaultAlert() != nil {
+		t.Error("expected default alert to be nil")
+	}
+}
+
+func TestAlertProvider_GetConfig(t *testing.T) {
+	scenarios := []struct {
+		Name           string
+		Provider       AlertProvider
+		InputAlert     alert.Alert
+		ExpectedOutput Config
+	}{
+		{
+			Name: "provider-no-override-should-default",
+			Provider: AlertProvider{
+				DefaultConfig: Config{RepositoryURL: "https://gitea.com/TwiN/test", Token: "12345"},
+			},
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{RepositoryURL: "https://gitea.com/TwiN/test", Token: "12345"},
+		},
+		{
+			Name: "provider-with-alert-override",
+			Provider: AlertProvider{
+				DefaultConfig: Config{RepositoryURL: "https://gitea.com/TwiN/test", Token: "12345"},
+			},
+			InputAlert:     alert.Alert{ProviderOverride: map[string]any{"repository-url": "https://gitea.com/TwiN/alert-test", "token": "54321", "assignees": []string{"TwiN"}}},
+			ExpectedOutput: Config{RepositoryURL: "https://gitea.com/TwiN/alert-test", Token: "54321", Assignees: []string{"TwiN"}},
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(scenario.Name, func(t *testing.T) {
+			got, err := scenario.Provider.GetConfig("", &scenario.InputAlert)
+			if err != nil && !strings.Contains(err.Error(), "user does not exist") && !strings.Contains(err.Error(), "no such host") {
+				t.Fatalf("unexpected error: %s", err)
+			}
+			if got.RepositoryURL != scenario.ExpectedOutput.RepositoryURL {
+				t.Errorf("expected repository URL %s, got %s", scenario.ExpectedOutput.RepositoryURL, got.RepositoryURL)
+			}
+			if got.Token != scenario.ExpectedOutput.Token {
+				t.Errorf("expected token %s, got %s", scenario.ExpectedOutput.Token, got.Token)
+			}
+			if len(got.Assignees) != len(scenario.ExpectedOutput.Assignees) {
+				t.Errorf("expected %d assignees, got %d", len(scenario.ExpectedOutput.Assignees), len(got.Assignees))
+			}
+			for i, assignee := range got.Assignees {
+				if assignee != scenario.ExpectedOutput.Assignees[i] {
+					t.Errorf("expected assignee %s, got %s", scenario.ExpectedOutput.Assignees[i], assignee)
+				}
+			}
+			// Test ValidateOverrides as well, since it really just calls GetConfig
+			if err = scenario.Provider.ValidateOverrides("", &scenario.InputAlert); err != nil && !strings.Contains(err.Error(), "user does not exist") {
+				t.Errorf("unexpected error: %s", err)
+			}
+		})
+	}
+}

alerting/provider/github/github.go

@@ -2,6 +2,7 @@ package github
 
 import (
 	"context"
+	"errors"
 	"fmt"
 	"net/url"
 	"strings"
@@ -11,69 +12,104 @@ import (
 	"github.com/TwiN/gatus/v5/config/endpoint"
 	"github.com/google/go-github/v48/github"
 	"golang.org/x/oauth2"
+	"gopkg.in/yaml.v3"
 )
 
-// AlertProvider is the configuration necessary for sending an alert using Discord
-type AlertProvider struct {
+var (
+	ErrRepositoryURLNotSet  = errors.New("repository-url not set")
+	ErrInvalidRepositoryURL = errors.New("invalid repository-url")
+	ErrTokenNotSet          = errors.New("token not set")
+)
+
+type Config struct {
 	RepositoryURL string `yaml:"repository-url"` // The URL of the GitHub repository to create issues in
 	Token         string `yaml:"token"`          // Token requires at least RW on issues and RO on metadata
 
-	// DefaultAlert is the default alert configuration to use for endpoints with an alert of the appropriate type
-	DefaultAlert *alert.Alert `yaml:"default-alert,omitempty"`
-
 	username        string
 	repositoryOwner string
 	repositoryName  string
 	githubClient    *github.Client
 }
 
-// IsValid returns whether the provider's configuration is valid
-func (provider *AlertProvider) IsValid() bool {
-	if len(provider.Token) == 0 || len(provider.RepositoryURL) == 0 {
-		return false
+func (cfg *Config) Validate() error {
+	if len(cfg.RepositoryURL) == 0 {
+		return ErrRepositoryURLNotSet
+	}
+	if len(cfg.Token) == 0 {
+		return ErrTokenNotSet
 	}
 	// Validate format of the repository URL
-	repositoryURL, err := url.Parse(provider.RepositoryURL)
+	repositoryURL, err := url.Parse(cfg.RepositoryURL)
 	if err != nil {
-		return false
+		return err
 	}
 	baseURL := repositoryURL.Scheme + "://" + repositoryURL.Host
 	pathParts := strings.Split(repositoryURL.Path, "/")
 	if len(pathParts) != 3 {
-		return false
+		return ErrInvalidRepositoryURL
 	}
-	provider.repositoryOwner = pathParts[1]
-	provider.repositoryName = pathParts[2]
+	if cfg.repositoryOwner == pathParts[1] && cfg.repositoryName == pathParts[2] && cfg.githubClient != nil {
+		// Already validated, let's skip the rest of the validation to avoid unnecessary API calls
+		return nil
+	}
+	cfg.repositoryOwner = pathParts[1]
+	cfg.repositoryName = pathParts[2]
 	// Create oauth2 HTTP client with GitHub token
 	httpClientWithStaticTokenSource := oauth2.NewClient(context.Background(), oauth2.StaticTokenSource(&oauth2.Token{
-		AccessToken: provider.Token,
+		AccessToken: cfg.Token,
 	}))
 	// Create GitHub client
 	if baseURL == "https://github.com" {
-		provider.githubClient = github.NewClient(httpClientWithStaticTokenSource)
+		cfg.githubClient = github.NewClient(httpClientWithStaticTokenSource)
 	} else {
-		provider.githubClient, err = github.NewEnterpriseClient(baseURL, baseURL, httpClientWithStaticTokenSource)
+		cfg.githubClient, err = github.NewEnterpriseClient(baseURL, baseURL, httpClientWithStaticTokenSource)
 		if err != nil {
-			return false
+			return fmt.Errorf("failed to create enterprise GitHub client: %w", err)
 		}
 	}
 	// Retrieve the username once to validate that the token is valid
 	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
 	defer cancel()
-	user, _, err := provider.githubClient.Users.Get(ctx, "")
+	user, _, err := cfg.githubClient.Users.Get(ctx, "")
 	if err != nil {
-		return false
+		return fmt.Errorf("failed to retrieve GitHub user: %w", err)
 	}
-	provider.username = *user.Login
-	return true
+	cfg.username = *user.Login
+	return nil
+}
+
+func (cfg *Config) Merge(override *Config) {
+	if len(override.RepositoryURL) > 0 {
+		cfg.RepositoryURL = override.RepositoryURL
+	}
+	if len(override.Token) > 0 {
+		cfg.Token = override.Token
+	}
+}
+
+// AlertProvider is the configuration necessary for sending an alert using Discord
+type AlertProvider struct {
+	DefaultConfig Config `yaml:",inline"`
+
+	// DefaultAlert is the default alert configuration to use for endpoints with an alert of the appropriate type
+	DefaultAlert *alert.Alert `yaml:"default-alert,omitempty"`
+}
+
+// Validate the provider's configuration
+func (provider *AlertProvider) Validate() error {
+	return provider.DefaultConfig.Validate()
 }
 
 // Send creates an issue in the designed RepositoryURL if the resolved parameter passed is false,
 // or closes the relevant issue(s) if the resolved parameter passed is true.
 func (provider *AlertProvider) Send(ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) error {
+	cfg, err := provider.GetConfig(ep.Group, alert)
+	if err != nil {
+		return err
+	}
 	title := "alert(gatus): " + ep.DisplayName()
 	if !resolved {
-		_, _, err := provider.githubClient.Issues.Create(context.Background(), provider.repositoryOwner, provider.repositoryName, &github.IssueRequest{
+		_, _, err := cfg.githubClient.Issues.Create(context.Background(), cfg.repositoryOwner, cfg.repositoryName, &github.IssueRequest{
 			Title: github.String(title),
 			Body:  github.String(provider.buildIssueBody(ep, alert, result)),
 		})
@@ -81,9 +117,9 @@ func (provider *AlertProvider) Send(ep *endpoint.Endpoint, alert *alert.Alert, r
 			return fmt.Errorf("failed to create issue: %w", err)
 		}
 	} else {
-		issues, _, err := provider.githubClient.Issues.ListByRepo(context.Background(), provider.repositoryOwner, provider.repositoryName, &github.IssueListByRepoOptions{
+		issues, _, err := cfg.githubClient.Issues.ListByRepo(context.Background(), cfg.repositoryOwner, cfg.repositoryName, &github.IssueListByRepoOptions{
 			State:       "open",
-			Creator:     provider.username,
+			Creator:     cfg.username,
 			ListOptions: github.ListOptions{PerPage: 100},
 		})
 		if err != nil {
@@ -91,7 +127,7 @@ func (provider *AlertProvider) Send(ep *endpoint.Endpoint, alert *alert.Alert, r
 		}
 		for _, issue := range issues {
 			if *issue.Title == title {
-				_, _, err = provider.githubClient.Issues.Edit(context.Background(), provider.repositoryOwner, provider.repositoryName, *issue.Number, &github.IssueRequest{
+				_, _, err = cfg.githubClient.Issues.Edit(context.Background(), cfg.repositoryOwner, cfg.repositoryName, *issue.Number, &github.IssueRequest{
 					State: github.String("closed"),
 				})
 				if err != nil {
@@ -130,3 +166,25 @@ func (provider *AlertProvider) buildIssueBody(ep *endpoint.Endpoint, alert *aler
 func (provider *AlertProvider) GetDefaultAlert() *alert.Alert {
 	return provider.DefaultAlert
 }
+
+// GetConfig returns the configuration for the provider with the overrides applied
+func (provider *AlertProvider) GetConfig(group string, alert *alert.Alert) (*Config, error) {
+	cfg := provider.DefaultConfig
+	// Handle alert overrides
+	if len(alert.ProviderOverride) != 0 {
+		overrideConfig := Config{}
+		if err := yaml.Unmarshal(alert.ProviderOverrideAsBytes(), &overrideConfig); err != nil {
+			return nil, err
+		}
+		cfg.Merge(&overrideConfig)
+	}
+	// Validate the configuration (we're returning the cfg here even if there's an error mostly for testing purposes)
+	err := cfg.Validate()
+	return &cfg, err
+}
+
+// ValidateOverrides validates the alert's provider override and, if present, the group override
+func (provider *AlertProvider) ValidateOverrides(group string, alert *alert.Alert) error {
+	_, err := provider.GetConfig(group, alert)
+	return err
+}

alerting/provider/github/github_test.go

@@ -12,42 +12,46 @@ import (
 	"github.com/google/go-github/v48/github"
 )
 
-func TestAlertDefaultProvider_IsValid(t *testing.T) {
+func TestAlertProvider_Validate(t *testing.T) {
 	scenarios := []struct {
-		Name     string
-		Provider AlertProvider
-		Expected bool
+		Name          string
+		Provider      AlertProvider
+		ExpectedError bool
 	}{
 		{
-			Name:     "invalid",
-			Provider: AlertProvider{RepositoryURL: "", Token: ""},
-			Expected: false,
+			Name:          "invalid",
+			Provider:      AlertProvider{DefaultConfig: Config{RepositoryURL: "", Token: ""}},
+			ExpectedError: true,
 		},
 		{
-			Name:     "invalid-token",
-			Provider: AlertProvider{RepositoryURL: "https://github.com/TwiN/test", Token: "12345"},
-			Expected: false,
+			Name:          "invalid-token",
+			Provider:      AlertProvider{DefaultConfig: Config{RepositoryURL: "https://github.com/TwiN/test", Token: "12345"}},
+			ExpectedError: true,
 		},
 		{
-			Name:     "missing-repository-name",
-			Provider: AlertProvider{RepositoryURL: "https://github.com/TwiN", Token: "12345"},
-			Expected: false,
+			Name:          "missing-repository-name",
+			Provider:      AlertProvider{DefaultConfig: Config{RepositoryURL: "https://github.com/TwiN", Token: "12345"}},
+			ExpectedError: true,
 		},
 		{
-			Name:     "enterprise-client",
-			Provider: AlertProvider{RepositoryURL: "https://github.example.com/TwiN/test", Token: "12345"},
-			Expected: false,
+			Name:          "enterprise-client",
+			Provider:      AlertProvider{DefaultConfig: Config{RepositoryURL: "https://github.example.com/TwiN/test", Token: "12345"}},
+			ExpectedError: true,
 		},
 		{
-			Name:     "invalid-url",
-			Provider: AlertProvider{RepositoryURL: "github.com/TwiN/test", Token: "12345"},
-			Expected: false,
+			Name:          "invalid-url",
+			Provider:      AlertProvider{DefaultConfig: Config{RepositoryURL: "github.com/TwiN/test", Token: "12345"}},
+			ExpectedError: true,
 		},
 	}
 	for _, scenario := range scenarios {
 		t.Run(scenario.Name, func(t *testing.T) {
-			if scenario.Provider.IsValid() != scenario.Expected {
-				t.Errorf("expected %t, got %t", scenario.Expected, scenario.Provider.IsValid())
+			err := scenario.Provider.Validate()
+			if scenario.ExpectedError && err == nil {
+				t.Error("expected error, got none")
+			}
+			if !scenario.ExpectedError && err != nil && !strings.Contains(err.Error(), "user does not exist") && !strings.Contains(err.Error(), "no such host") {
+				t.Error("expected no error, got", err.Error())
 			}
 		})
 	}
@@ -67,14 +71,14 @@ func TestAlertProvider_Send(t *testing.T) {
 	}{
 		{
 			Name:          "triggered-error",
-			Provider:      AlertProvider{RepositoryURL: "https://github.com/TwiN/test", Token: "12345"},
+			Provider:      AlertProvider{DefaultConfig: Config{RepositoryURL: "https://github.com/TwiN/test", Token: "12345"}},
 			Alert:         alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved:      false,
 			ExpectedError: true,
 		},
 		{
 			Name:          "resolved-error",
-			Provider:      AlertProvider{RepositoryURL: "https://github.com/TwiN/test", Token: "12345"},
+			Provider:      AlertProvider{DefaultConfig: Config{RepositoryURL: "https://github.com/TwiN/test", Token: "12345"}},
 			Alert:         alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved:      true,
 			ExpectedError: true,
@@ -82,9 +86,13 @@ func TestAlertProvider_Send(t *testing.T) {
 	}
 	for _, scenario := range scenarios {
 		t.Run(scenario.Name, func(t *testing.T) {
-			scenario.Provider.githubClient = github.NewClient(nil)
+			cfg, err := scenario.Provider.GetConfig("", &scenario.Alert)
+			if err != nil && !strings.Contains(err.Error(), "failed to retrieve GitHub user") && !strings.Contains(err.Error(), "no such host") {
+				t.Error("expected no error, got", err.Error())
+			}
+			cfg.githubClient = github.NewClient(nil)
 			client.InjectHTTPClient(&http.Client{Transport: scenario.MockRoundTripper})
-			err := scenario.Provider.Send(
+			err = scenario.Provider.Send(
 				&endpoint.Endpoint{Name: "endpoint-name", Group: "endpoint-group"},
 				&scenario.Alert,
 				&endpoint.Result{
@@ -167,3 +175,47 @@ func TestAlertProvider_GetDefaultAlert(t *testing.T) {
 		t.Error("expected default alert to be nil")
 	}
 }
+
+func TestAlertProvider_GetConfig(t *testing.T) {
+	scenarios := []struct {
+		Name           string
+		Provider       AlertProvider
+		InputAlert     alert.Alert
+		ExpectedOutput Config
+	}{
+		{
+			Name: "provider-no-override-should-default",
+			Provider: AlertProvider{
+				DefaultConfig: Config{RepositoryURL: "https://github.com/TwiN/test", Token: "12345"},
+			},
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{RepositoryURL: "https://github.com/TwiN/test", Token: "12345"},
+		},
+		{
+			Name: "provider-with-alert-override",
+			Provider: AlertProvider{
+				DefaultConfig: Config{RepositoryURL: "https://github.com/TwiN/test", Token: "12345"},
+			},
+			InputAlert:     alert.Alert{ProviderOverride: map[string]any{"repository-url": "https://github.com/TwiN/alert-test", "token": "54321"}},
+			ExpectedOutput: Config{RepositoryURL: "https://github.com/TwiN/alert-test", Token: "54321"},
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(scenario.Name, func(t *testing.T) {
+			got, err := scenario.Provider.GetConfig("", &scenario.InputAlert)
+			if err != nil && !strings.Contains(err.Error(), "failed to retrieve GitHub user") && !strings.Contains(err.Error(), "no such host") {
+				t.Fatalf("unexpected error: %s", err)
+			}
+			if got.RepositoryURL != scenario.ExpectedOutput.RepositoryURL {
+				t.Errorf("expected repository URL %s, got %s", scenario.ExpectedOutput.RepositoryURL, got.RepositoryURL)
+			}
+			if got.Token != scenario.ExpectedOutput.Token {
+				t.Errorf("expected token %s, got %s", scenario.ExpectedOutput.Token, got.Token)
+			}
+			// Test ValidateOverrides as well, since it really just calls GetConfig
+			if err = scenario.Provider.ValidateOverrides("", &scenario.InputAlert); err != nil && !strings.Contains(err.Error(), "failed to retrieve GitHub user") {
+				t.Errorf("unexpected error: %s", err)
+			}
+		})
+	}
+}

alerting/provider/gitlab/gitlab.go

@@ -13,55 +13,97 @@ import (
 	"github.com/TwiN/gatus/v5/client"
 	"github.com/TwiN/gatus/v5/config/endpoint"
 	"github.com/google/uuid"
+	"gopkg.in/yaml.v3"
 )
 
+const (
+	DefaultSeverity       = "critical"
+	DefaultMonitoringTool = "gatus"
+)
+
+var (
+	ErrInvalidWebhookURL      = fmt.Errorf("invalid webhook-url")
+	ErrAuthorizationKeyNotSet = fmt.Errorf("authorization-key not set")
+)
+
+type Config struct {
+	WebhookURL       string `yaml:"webhook-url"`                // The webhook url provided by GitLab
+	AuthorizationKey string `yaml:"authorization-key"`          // The authorization key provided by GitLab
+	Severity         string `yaml:"severity,omitempty"`         // Severity can be one of: critical, high, medium, low, info, unknown. Defaults to critical
+	MonitoringTool   string `yaml:"monitoring-tool,omitempty"`  // MonitoringTool overrides the name sent to gitlab. Defaults to gatus
+	EnvironmentName  string `yaml:"environment-name,omitempty"` // EnvironmentName is the name of the associated GitLab environment. Required to display alerts on a dashboard.
+	Service          string `yaml:"service,omitempty"`          // Service affected. Defaults to the endpoint's display name
+}
+
+func (cfg *Config) Validate() error {
+	if len(cfg.WebhookURL) == 0 {
+		return ErrInvalidWebhookURL
+	} else if _, err := url.Parse(cfg.WebhookURL); err != nil {
+		return ErrInvalidWebhookURL
+	}
+	if len(cfg.AuthorizationKey) == 0 {
+		return ErrAuthorizationKeyNotSet
+	}
+	if len(cfg.Severity) == 0 {
+		cfg.Severity = DefaultSeverity
+	}
+	if len(cfg.MonitoringTool) == 0 {
+		cfg.MonitoringTool = DefaultMonitoringTool
+	}
+	return nil
+}
+
+func (cfg *Config) Merge(override *Config) {
+	if len(override.WebhookURL) > 0 {
+		cfg.WebhookURL = override.WebhookURL
+	}
+	if len(override.AuthorizationKey) > 0 {
+		cfg.AuthorizationKey = override.AuthorizationKey
+	}
+	if len(override.Severity) > 0 {
+		cfg.Severity = override.Severity
+	}
+	if len(override.MonitoringTool) > 0 {
+		cfg.MonitoringTool = override.MonitoringTool
+	}
+	if len(override.EnvironmentName) > 0 {
+		cfg.EnvironmentName = override.EnvironmentName
+	}
+	if len(override.Service) > 0 {
+		cfg.Service = override.Service
+	}
+}
+
 // AlertProvider is the configuration necessary for sending an alert using GitLab
 type AlertProvider struct {
-	WebhookURL       string `yaml:"webhook-url"`       // The webhook url provided by GitLab
-	AuthorizationKey string `yaml:"authorization-key"` // The authorization key provided by GitLab
+	DefaultConfig Config `yaml:",inline"`
 
 	// DefaultAlert is the default alert configuration to use for endpoints with an alert of the appropriate type
 	DefaultAlert *alert.Alert `yaml:"default-alert,omitempty"`
-
-	// Severity can be one of: critical, high, medium, low, info, unknown. Defaults to critical
-	Severity string `yaml:"severity,omitempty"`
-
-	// MonitoringTool overrides the name sent to gitlab. Defaults to gatus
-	MonitoringTool string `yaml:"monitoring-tool,omitempty"`
-
-	// EnvironmentName is the name of the associated GitLab environment. Required to display alerts on a dashboard.
-	EnvironmentName string `yaml:"environment-name,omitempty"`
-
-	// Service affected. Defaults to endpoint display name
-	Service string `yaml:"service,omitempty"`
 }
 
-// IsValid returns whether the provider's configuration is valid
-func (provider *AlertProvider) IsValid() bool {
-	if len(provider.AuthorizationKey) == 0 || len(provider.WebhookURL) == 0 {
-		return false
-	}
-	// Validate format of the repository URL
-	_, err := url.Parse(provider.WebhookURL)
-	if err != nil {
-		return false
-	}
-	return true
+// Validate the provider's configuration
+func (provider *AlertProvider) Validate() error {
+	return provider.DefaultConfig.Validate()
 }
 
 // Send creates an issue in the designed RepositoryURL if the resolved parameter passed is false,
 // or closes the relevant issue(s) if the resolved parameter passed is true.
 func (provider *AlertProvider) Send(ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) error {
+	cfg, err := provider.GetConfig(ep.Group, alert)
+	if err != nil {
+		return err
+	}
 	if len(alert.ResolveKey) == 0 {
 		alert.ResolveKey = uuid.NewString()
 	}
-	buffer := bytes.NewBuffer(provider.buildAlertBody(ep, alert, result, resolved))
-	request, err := http.NewRequest(http.MethodPost, provider.WebhookURL, buffer)
+	buffer := bytes.NewBuffer(provider.buildAlertBody(cfg, ep, alert, result, resolved))
+	request, err := http.NewRequest(http.MethodPost, cfg.WebhookURL, buffer)
 	if err != nil {
 		return err
 	}
 	request.Header.Set("Content-Type", "application/json")
-	request.Header.Set("Authorization", fmt.Sprintf("Bearer %s", provider.AuthorizationKey))
+	request.Header.Set("Authorization", fmt.Sprintf("Bearer %s", cfg.AuthorizationKey))
 	response, err := client.GetHTTPClient(nil).Do(request)
 	if err != nil {
 		return err
@@ -87,30 +129,20 @@ type AlertBody struct {
 	GitlabEnvironmentName string `json:"gitlab_environment_name,omitempty"` // The name of the associated GitLab environment. Required to display alerts on a dashboard.
 }
 
-func (provider *AlertProvider) monitoringTool() string {
-	if len(provider.MonitoringTool) > 0 {
-		return provider.MonitoringTool
-	}
-	return "gatus"
-}
-
-func (provider *AlertProvider) service(ep *endpoint.Endpoint) string {
-	if len(provider.Service) > 0 {
-		return provider.Service
-	}
-	return ep.DisplayName()
-}
-
 // buildAlertBody builds the body of the alert
-func (provider *AlertProvider) buildAlertBody(ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) []byte {
+func (provider *AlertProvider) buildAlertBody(cfg *Config, ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) []byte {
+	service := cfg.Service
+	if len(service) == 0 {
+		service = ep.DisplayName()
+	}
 	body := AlertBody{
-		Title:                 fmt.Sprintf("alert(%s): %s", provider.monitoringTool(), provider.service(ep)),
+		Title:                 fmt.Sprintf("alert(%s): %s", cfg.MonitoringTool, service),
 		StartTime:             result.Timestamp.Format(time.RFC3339),
-		Service:               provider.service(ep),
-		MonitoringTool:        provider.monitoringTool(),
+		Service:               service,
+		MonitoringTool:        cfg.MonitoringTool,
 		Hosts:                 ep.URL,
-		GitlabEnvironmentName: provider.EnvironmentName,
-		Severity:              provider.Severity,
+		GitlabEnvironmentName: cfg.EnvironmentName,
+		Severity:              cfg.Severity,
 		Fingerprint:           alert.ResolveKey,
 	}
 	if resolved {
@@ -148,3 +180,25 @@ func (provider *AlertProvider) buildAlertBody(ep *endpoint.Endpoint, alert *aler
 func (provider *AlertProvider) GetDefaultAlert() *alert.Alert {
 	return provider.DefaultAlert
 }
+
+// GetConfig returns the configuration for the provider with the overrides applied
+func (provider *AlertProvider) GetConfig(group string, alert *alert.Alert) (*Config, error) {
+	cfg := provider.DefaultConfig
+	// Handle alert overrides
+	if len(alert.ProviderOverride) != 0 {
+		overrideConfig := Config{}
+		if err := yaml.Unmarshal(alert.ProviderOverrideAsBytes(), &overrideConfig); err != nil {
+			return nil, err
+		}
+		cfg.Merge(&overrideConfig)
+	}
+	// Validate the configuration (we're returning the cfg here even if there's an error mostly for testing purposes)
+	err := cfg.Validate()
+	return &cfg, err
+}
+
+// ValidateOverrides validates the alert's provider override and, if present, the group override
+func (provider *AlertProvider) ValidateOverrides(group string, alert *alert.Alert) error {
+	_, err := provider.GetConfig(group, alert)
+	return err
+}

alerting/provider/gitlab/gitlab_test.go

@@ -11,37 +11,41 @@ import (
 	"github.com/TwiN/gatus/v5/test"
 )
 
-func TestAlertDefaultProvider_IsValid(t *testing.T) {
+func TestAlertProvider_Validate(t *testing.T) {
 	scenarios := []struct {
-		Name     string
-		Provider AlertProvider
-		Expected bool
+		Name          string
+		Provider      AlertProvider
+		ExpectedError bool
 	}{
 		{
-			Name:     "invalid",
-			Provider: AlertProvider{WebhookURL: "", AuthorizationKey: ""},
-			Expected: false,
+			Name:          "invalid",
+			Provider:      AlertProvider{DefaultConfig: Config{WebhookURL: "", AuthorizationKey: ""}},
+			ExpectedError: true,
 		},
 		{
-			Name:     "missing-webhook-url",
-			Provider: AlertProvider{WebhookURL: "", AuthorizationKey: "12345"},
-			Expected: false,
+			Name:          "missing-webhook-url",
+			Provider:      AlertProvider{DefaultConfig: Config{WebhookURL: "", AuthorizationKey: "12345"}},
+			ExpectedError: true,
 		},
 		{
-			Name:     "missing-authorization-key",
-			Provider: AlertProvider{WebhookURL: "https://gitlab.com/hlidotbe/text/alerts/notify/gatus/xxxxxxxxxxxxxxxx.json", AuthorizationKey: ""},
-			Expected: false,
+			Name:          "missing-authorization-key",
+			Provider:      AlertProvider{DefaultConfig: Config{WebhookURL: "https://gitlab.com/whatever/text/alerts/notify/gatus/xxxxxxxxxxxxxxxx.json", AuthorizationKey: ""}},
+			ExpectedError: true,
 		},
 		{
-			Name:     "invalid-url",
-			Provider: AlertProvider{WebhookURL: " http://foo.com", AuthorizationKey: "12345"},
-			Expected: false,
+			Name:          "invalid-url",
+			Provider:      AlertProvider{DefaultConfig: Config{WebhookURL: " http://foo.com", AuthorizationKey: "12345"}},
+			ExpectedError: true,
 		},
 	}
 	for _, scenario := range scenarios {
 		t.Run(scenario.Name, func(t *testing.T) {
-			if scenario.Provider.IsValid() != scenario.Expected {
-				t.Errorf("expected %t, got %t", scenario.Expected, scenario.Provider.IsValid())
+			err := scenario.Provider.Validate()
+			if scenario.ExpectedError && err == nil {
+				t.Error("expected error, got none")
+			}
+			if !scenario.ExpectedError && err != nil && !strings.Contains(err.Error(), "user does not exist") && !strings.Contains(err.Error(), "no such host") {
+				t.Error("expected no error, got", err.Error())
 			}
 		})
 	}
@@ -61,7 +65,7 @@ func TestAlertProvider_Send(t *testing.T) {
 	}{
 		{
 			Name:          "triggered-error",
-			Provider:      AlertProvider{WebhookURL: "https://gitlab.com/hlidotbe/text/alerts/notify/gatus/xxxxxxxxxxxxxxxx.json", AuthorizationKey: "12345"},
+			Provider:      AlertProvider{DefaultConfig: Config{WebhookURL: "https://gitlab.com/hlidotbe/text/alerts/notify/gatus/xxxxxxxxxxxxxxxx.json", AuthorizationKey: "12345"}},
 			Alert:         alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved:      false,
 			ExpectedError: false,
@@ -71,7 +75,7 @@ func TestAlertProvider_Send(t *testing.T) {
 		},
 		{
 			Name:          "resolved-error",
-			Provider:      AlertProvider{WebhookURL: "https://gitlab.com/hlidotbe/text/alerts/notify/gatus/xxxxxxxxxxxxxxxx.json", AuthorizationKey: "12345"},
+			Provider:      AlertProvider{DefaultConfig: Config{WebhookURL: "https://gitlab.com/hlidotbe/text/alerts/notify/gatus/xxxxxxxxxxxxxxxx.json", AuthorizationKey: "12345"}},
 			Alert:         alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved:      true,
 			ExpectedError: false,
@@ -116,21 +120,26 @@ func TestAlertProvider_buildAlertBody(t *testing.T) {
 		{
 			Name:         "triggered",
 			Endpoint:     endpoint.Endpoint{Name: "endpoint-name", URL: "https://example.org"},
-			Provider:     AlertProvider{},
+			Provider:     AlertProvider{DefaultConfig: Config{WebhookURL: "https://gitlab.com/hlidotbe/text/alerts/notify/gatus/xxxxxxxxxxxxxxxx.json", AuthorizationKey: "12345"}},
 			Alert:        alert.Alert{Description: &firstDescription, FailureThreshold: 3},
-			ExpectedBody: "{\"title\":\"alert(gatus): endpoint-name\",\"description\":\"An alert for *endpoint-name* has been triggered due to having failed 3 time(s) in a row:\\n\\u003e description-1\\n\\n## Condition results\\n- :white_check_mark: - `[CONNECTED] == true`\\n- :x: - `[STATUS] == 200`\\n\",\"start_time\":\"0001-01-01T00:00:00Z\",\"service\":\"endpoint-name\",\"monitoring_tool\":\"gatus\",\"hosts\":\"https://example.org\"}",
+			ExpectedBody: "{\"title\":\"alert(gatus): endpoint-name\",\"description\":\"An alert for *endpoint-name* has been triggered due to having failed 3 time(s) in a row:\\n\\u003e description-1\\n\\n## Condition results\\n- :white_check_mark: - `[CONNECTED] == true`\\n- :x: - `[STATUS] == 200`\\n\",\"start_time\":\"0001-01-01T00:00:00Z\",\"service\":\"endpoint-name\",\"monitoring_tool\":\"gatus\",\"hosts\":\"https://example.org\",\"severity\":\"critical\"}",
 		},
 		{
 			Name:         "no-description",
 			Endpoint:     endpoint.Endpoint{Name: "endpoint-name", URL: "https://example.org"},
-			Provider:     AlertProvider{},
+			Provider:     AlertProvider{DefaultConfig: Config{WebhookURL: "https://gitlab.com/hlidotbe/text/alerts/notify/gatus/xxxxxxxxxxxxxxxx.json", AuthorizationKey: "12345"}},
 			Alert:        alert.Alert{FailureThreshold: 10},
-			ExpectedBody: "{\"title\":\"alert(gatus): endpoint-name\",\"description\":\"An alert for *endpoint-name* has been triggered due to having failed 10 time(s) in a row\\n\\n## Condition results\\n- :white_check_mark: - `[CONNECTED] == true`\\n- :x: - `[STATUS] == 200`\\n\",\"start_time\":\"0001-01-01T00:00:00Z\",\"service\":\"endpoint-name\",\"monitoring_tool\":\"gatus\",\"hosts\":\"https://example.org\"}",
+			ExpectedBody: "{\"title\":\"alert(gatus): endpoint-name\",\"description\":\"An alert for *endpoint-name* has been triggered due to having failed 10 time(s) in a row\\n\\n## Condition results\\n- :white_check_mark: - `[CONNECTED] == true`\\n- :x: - `[STATUS] == 200`\\n\",\"start_time\":\"0001-01-01T00:00:00Z\",\"service\":\"endpoint-name\",\"monitoring_tool\":\"gatus\",\"hosts\":\"https://example.org\",\"severity\":\"critical\"}",
 		},
 	}
 	for _, scenario := range scenarios {
 		t.Run(scenario.Name, func(t *testing.T) {
+			cfg, err := scenario.Provider.GetConfig("", &scenario.Alert)
+			if err != nil {
+				t.Error("expected no error, got", err.Error())
+			}
 			body := scenario.Provider.buildAlertBody(
+				cfg,
 				&scenario.Endpoint,
 				&scenario.Alert,
 				&endpoint.Result{
@@ -156,3 +165,59 @@ func TestAlertProvider_GetDefaultAlert(t *testing.T) {
 		t.Error("expected default alert to be nil")
 	}
 }
+
+func TestAlertProvider_GetConfig(t *testing.T) {
+	scenarios := []struct {
+		Name           string
+		Provider       AlertProvider
+		InputAlert     alert.Alert
+		ExpectedOutput Config
+	}{
+		{
+			Name: "provider-no-override-should-default",
+			Provider: AlertProvider{
+				DefaultConfig: Config{WebhookURL: "https://github.com/TwiN/test", AuthorizationKey: "12345"},
+			},
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{WebhookURL: "https://github.com/TwiN/test", AuthorizationKey: "12345", Severity: DefaultSeverity, MonitoringTool: DefaultMonitoringTool},
+		},
+		{
+			Name: "provider-with-alert-override",
+			Provider: AlertProvider{
+				DefaultConfig: Config{WebhookURL: "https://github.com/TwiN/test", AuthorizationKey: "12345"},
+			},
+			InputAlert:     alert.Alert{ProviderOverride: map[string]any{"repository-url": "https://github.com/TwiN/alert-test", "authorization-key": "54321", "severity": "info", "monitoring-tool": "not-gatus", "environment-name": "prod", "service": "example"}},
+			ExpectedOutput: Config{WebhookURL: "https://github.com/TwiN/test", AuthorizationKey: "54321", Severity: "info", MonitoringTool: "not-gatus", EnvironmentName: "prod", Service: "example"},
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(scenario.Name, func(t *testing.T) {
+			got, err := scenario.Provider.GetConfig("", &scenario.InputAlert)
+			if err != nil && !strings.Contains(err.Error(), "user does not exist") && !strings.Contains(err.Error(), "no such host") {
+				t.Fatalf("unexpected error: %s", err)
+			}
+			if got.WebhookURL != scenario.ExpectedOutput.WebhookURL {
+				t.Errorf("expected repository URL %s, got %s", scenario.ExpectedOutput.WebhookURL, got.WebhookURL)
+			}
+			if got.AuthorizationKey != scenario.ExpectedOutput.AuthorizationKey {
+				t.Errorf("expected AuthorizationKey %s, got %s", scenario.ExpectedOutput.AuthorizationKey, got.AuthorizationKey)
+			}
+			if got.Severity != scenario.ExpectedOutput.Severity {
+				t.Errorf("expected Severity %s, got %s", scenario.ExpectedOutput.Severity, got.Severity)
+			}
+			if got.MonitoringTool != scenario.ExpectedOutput.MonitoringTool {
+				t.Errorf("expected MonitoringTool %s, got %s", scenario.ExpectedOutput.MonitoringTool, got.MonitoringTool)
+			}
+			if got.EnvironmentName != scenario.ExpectedOutput.EnvironmentName {
+				t.Errorf("expected EnvironmentName %s, got %s", scenario.ExpectedOutput.EnvironmentName, got.EnvironmentName)
+			}
+			if got.Service != scenario.ExpectedOutput.Service {
+				t.Errorf("expected Service %s, got %s", scenario.ExpectedOutput.Service, got.Service)
+			}
+			// Test ValidateOverrides as well, since it really just calls GetConfig
+			if err = scenario.Provider.ValidateOverrides("", &scenario.InputAlert); err != nil {
+				t.Errorf("unexpected error: %s", err)
+			}
+		})
+	}
+}

alerting/provider/googlechat/googlechat.go

@@ -3,6 +3,7 @@ package googlechat
 import (
 	"bytes"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"io"
 	"net/http"
@@ -10,14 +11,38 @@ import (
 	"github.com/TwiN/gatus/v5/alerting/alert"
 	"github.com/TwiN/gatus/v5/client"
 	"github.com/TwiN/gatus/v5/config/endpoint"
+	"gopkg.in/yaml.v3"
 )
 
+var (
+	ErrWebhookURLNotSet       = errors.New("webhook-url not set")
+	ErrDuplicateGroupOverride = errors.New("duplicate group override")
+)
+
+type Config struct {
+	WebhookURL   string         `yaml:"webhook-url"`
+	ClientConfig *client.Config `yaml:"client,omitempty"`
+}
+
+func (cfg *Config) Validate() error {
+	if len(cfg.WebhookURL) == 0 {
+		return ErrWebhookURLNotSet
+	}
+	return nil
+}
+
+func (cfg *Config) Merge(override *Config) {
+	if override.ClientConfig != nil {
+		cfg.ClientConfig = override.ClientConfig
+	}
+	if len(override.WebhookURL) > 0 {
+		cfg.WebhookURL = override.WebhookURL
+	}
+}
+
 // AlertProvider is the configuration necessary for sending an alert using Google chat
 type AlertProvider struct {
-	WebhookURL string `yaml:"webhook-url"`
-
-	// ClientConfig is the configuration of the client used to communicate with the provider's target
-	ClientConfig *client.Config `yaml:"client,omitempty"`
+	DefaultConfig Config `yaml:",inline"`
 
 	// DefaultAlert is the default alert configuration to use for endpoints with an alert of the appropriate type
 	DefaultAlert *alert.Alert `yaml:"default-alert,omitempty"`
@@ -28,36 +53,37 @@ type AlertProvider struct {
 
 // Override is a case under which the default integration is overridden
 type Override struct {
-	Group      string `yaml:"group"`
-	WebhookURL string `yaml:"webhook-url"`
+	Group  string `yaml:"group"`
+	Config `yaml:",inline"`
 }
 
-// IsValid returns whether the provider's configuration is valid
-func (provider *AlertProvider) IsValid() bool {
-	if provider.ClientConfig == nil {
-		provider.ClientConfig = client.GetDefaultConfig()
-	}
+// Validate the provider's configuration
+func (provider *AlertProvider) Validate() error {
 	registeredGroups := make(map[string]bool)
 	if provider.Overrides != nil {
 		for _, override := range provider.Overrides {
 			if isAlreadyRegistered := registeredGroups[override.Group]; isAlreadyRegistered || override.Group == "" || len(override.WebhookURL) == 0 {
-				return false
+				return ErrDuplicateGroupOverride
 			}
 			registeredGroups[override.Group] = true
 		}
 	}
-	return len(provider.WebhookURL) > 0
+	return provider.DefaultConfig.Validate()
 }
 
 // Send an alert using the provider
 func (provider *AlertProvider) Send(ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) error {
+	cfg, err := provider.GetConfig(ep.Group, alert)
+	if err != nil {
+		return err
+	}
 	buffer := bytes.NewBuffer(provider.buildRequestBody(ep, alert, result, resolved))
-	request, err := http.NewRequest(http.MethodPost, provider.getWebhookURLForGroup(ep.Group), buffer)
+	request, err := http.NewRequest(http.MethodPost, cfg.WebhookURL, buffer)
 	if err != nil {
 		return err
 	}
 	request.Header.Set("Content-Type", "application/json")
-	response, err := client.GetHTTPClient(provider.ClientConfig).Do(request)
+	response, err := client.GetHTTPClient(cfg.ClientConfig).Do(request)
 	if err != nil {
 		return err
 	}
@@ -185,19 +211,38 @@ func (provider *AlertProvider) buildRequestBody(ep *endpoint.Endpoint, alert *al
 	return bodyAsJSON
 }
 
-// getWebhookURLForGroup returns the appropriate Webhook URL integration to for a given group
-func (provider *AlertProvider) getWebhookURLForGroup(group string) string {
-	if provider.Overrides != nil {
-		for _, override := range provider.Overrides {
-			if group == override.Group {
-				return override.WebhookURL
-			}
-		}
-	}
-	return provider.WebhookURL
-}
-
 // GetDefaultAlert returns the provider's default alert configuration
 func (provider *AlertProvider) GetDefaultAlert() *alert.Alert {
 	return provider.DefaultAlert
 }
+
+// GetConfig returns the configuration for the provider with the overrides applied
+func (provider *AlertProvider) GetConfig(group string, alert *alert.Alert) (*Config, error) {
+	cfg := provider.DefaultConfig
+	// Handle group overrides
+	if provider.Overrides != nil {
+		for _, override := range provider.Overrides {
+			if group == override.Group {
+				cfg.Merge(&override.Config)
+				break
+			}
+		}
+	}
+	// Handle alert overrides
+	if len(alert.ProviderOverride) != 0 {
+		overrideConfig := Config{}
+		if err := yaml.Unmarshal(alert.ProviderOverrideAsBytes(), &overrideConfig); err != nil {
+			return nil, err
+		}
+		cfg.Merge(&overrideConfig)
+	}
+	// Validate the configuration
+	err := cfg.Validate()
+	return &cfg, err
+}
+
+// ValidateOverrides validates the alert's provider override and, if present, the group override
+func (provider *AlertProvider) ValidateOverrides(group string, alert *alert.Alert) error {
+	_, err := provider.GetConfig(group, alert)
+	return err
+}

alerting/provider/googlechat/googlechat_test.go

@@ -11,50 +11,50 @@ import (
 	"github.com/TwiN/gatus/v5/test"
 )
 
-func TestAlertDefaultProvider_IsValid(t *testing.T) {
-	invalidProvider := AlertProvider{WebhookURL: ""}
-	if invalidProvider.IsValid() {
+func TestAlertProvider_Validate(t *testing.T) {
+	invalidProvider := AlertProvider{DefaultConfig: Config{WebhookURL: ""}}
+	if err := invalidProvider.Validate(); err == nil {
 		t.Error("provider shouldn't have been valid")
 	}
-	validProvider := AlertProvider{WebhookURL: "http://example.com"}
-	if !validProvider.IsValid() {
+	validProvider := AlertProvider{DefaultConfig: Config{WebhookURL: "http://example.com"}}
+	if err := validProvider.Validate(); err != nil {
 		t.Error("provider should've been valid")
 	}
 }
 
-func TestAlertProvider_IsValidWithOverride(t *testing.T) {
+func TestAlertProvider_ValidateWithOverride(t *testing.T) {
 	providerWithInvalidOverrideGroup := AlertProvider{
 		Overrides: []Override{
 			{
-				WebhookURL: "http://example.com",
-				Group:      "",
+				Config: Config{WebhookURL: "http://example.com"},
+				Group:  "",
 			},
 		},
 	}
-	if providerWithInvalidOverrideGroup.IsValid() {
+	if err := providerWithInvalidOverrideGroup.Validate(); err == nil {
 		t.Error("provider Group shouldn't have been valid")
 	}
 	providerWithInvalidOverrideTo := AlertProvider{
 		Overrides: []Override{
 			{
-				WebhookURL: "",
-				Group:      "group",
+				Config: Config{WebhookURL: ""},
+				Group:  "group",
 			},
 		},
 	}
-	if providerWithInvalidOverrideTo.IsValid() {
+	if err := providerWithInvalidOverrideTo.Validate(); err == nil {
 		t.Error("provider integration key shouldn't have been valid")
 	}
 	providerWithValidOverride := AlertProvider{
-		WebhookURL: "http://example.com",
+		DefaultConfig: Config{WebhookURL: "http://example.com"},
 		Overrides: []Override{
 			{
-				WebhookURL: "http://example.com",
-				Group:      "group",
+				Config: Config{WebhookURL: "http://example.com"},
+				Group:  "group",
 			},
 		},
 	}
-	if !providerWithValidOverride.IsValid() {
+	if err := providerWithValidOverride.Validate(); err != nil {
 		t.Error("provider should've been valid")
 	}
 }
@@ -73,7 +73,7 @@ func TestAlertProvider_Send(t *testing.T) {
 	}{
 		{
 			Name:     "triggered",
-			Provider: AlertProvider{},
+			Provider: AlertProvider{DefaultConfig: Config{WebhookURL: "http://example.com"}},
 			Alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved: false,
 			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
@@ -83,7 +83,7 @@ func TestAlertProvider_Send(t *testing.T) {
 		},
 		{
 			Name:     "triggered-error",
-			Provider: AlertProvider{},
+			Provider: AlertProvider{DefaultConfig: Config{WebhookURL: "http://example.com"}},
 			Alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved: false,
 			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
@@ -93,7 +93,7 @@ func TestAlertProvider_Send(t *testing.T) {
 		},
 		{
 			Name:     "resolved",
-			Provider: AlertProvider{},
+			Provider: AlertProvider{DefaultConfig: Config{WebhookURL: "http://example.com"}},
 			Alert:    alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved: true,
 			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
@@ -103,7 +103,7 @@ func TestAlertProvider_Send(t *testing.T) {
 		},
 		{
 			Name:     "resolved-error",
-			Provider: AlertProvider{},
+			Provider: AlertProvider{DefaultConfig: Config{WebhookURL: "http://example.com"}},
 			Alert:    alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved: true,
 			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
@@ -213,64 +213,92 @@ func TestAlertProvider_GetDefaultAlert(t *testing.T) {
 	}
 }
 
-func TestAlertProvider_getWebhookURLForGroup(t *testing.T) {
-	tests := []struct {
+func TestAlertProvider_GetConfig(t *testing.T) {
+	scenarios := []struct {
 		Name           string
 		Provider       AlertProvider
 		InputGroup     string
-		ExpectedOutput string
+		InputAlert     alert.Alert
+		ExpectedOutput Config
 	}{
 		{
 			Name: "provider-no-override-specify-no-group-should-default",
 			Provider: AlertProvider{
-				WebhookURL: "http://example.com",
-				Overrides:  nil,
+				DefaultConfig: Config{WebhookURL: "http://example.com"},
+				Overrides:     nil,
 			},
 			InputGroup:     "",
-			ExpectedOutput: "http://example.com",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{WebhookURL: "http://example.com"},
 		},
 		{
 			Name: "provider-no-override-specify-group-should-default",
 			Provider: AlertProvider{
-				WebhookURL: "http://example.com",
-				Overrides:  nil,
+				DefaultConfig: Config{WebhookURL: "http://example.com"},
+				Overrides:     nil,
 			},
 			InputGroup:     "group",
-			ExpectedOutput: "http://example.com",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{WebhookURL: "http://example.com"},
 		},
 		{
 			Name: "provider-with-override-specify-no-group-should-default",
 			Provider: AlertProvider{
-				WebhookURL: "http://example.com",
+				DefaultConfig: Config{WebhookURL: "http://example.com"},
 				Overrides: []Override{
 					{
-						Group:      "group",
-						WebhookURL: "http://example01.com",
+						Group:  "group",
+						Config: Config{WebhookURL: "http://example01.com"},
 					},
 				},
 			},
 			InputGroup:     "",
-			ExpectedOutput: "http://example.com",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{WebhookURL: "http://example.com"},
 		},
 		{
 			Name: "provider-with-override-specify-group-should-override",
 			Provider: AlertProvider{
-				WebhookURL: "http://example.com",
+				DefaultConfig: Config{WebhookURL: "http://example.com"},
 				Overrides: []Override{
 					{
-						Group:      "group",
-						WebhookURL: "http://example01.com",
+						Group:  "group",
+						Config: Config{WebhookURL: "http://group-example.com"},
 					},
 				},
 			},
 			InputGroup:     "group",
-			ExpectedOutput: "http://example01.com",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{WebhookURL: "http://group-example.com"},
+		},
+		{
+			Name: "provider-with-group-override-and-alert-override--alert-override-should-take-precedence",
+			Provider: AlertProvider{
+				DefaultConfig: Config{WebhookURL: "http://example.com"},
+				Overrides: []Override{
+					{
+						Group:  "group",
+						Config: Config{WebhookURL: "http://group-example.com"},
+					},
+				},
+			},
+			InputGroup:     "group",
+			InputAlert:     alert.Alert{ProviderOverride: map[string]any{"webhook-url": "http://alert-example.com"}},
+			ExpectedOutput: Config{WebhookURL: "http://alert-example.com"},
 		},
 	}
-	for _, tt := range tests {
-		t.Run(tt.Name, func(t *testing.T) {
-			if got := tt.Provider.getWebhookURLForGroup(tt.InputGroup); got != tt.ExpectedOutput {
-				t.Errorf("AlertProvider.getToForGroup() = %v, want %v", got, tt.ExpectedOutput)
+	for _, scenario := range scenarios {
+		t.Run(scenario.Name, func(t *testing.T) {
+			got, err := scenario.Provider.GetConfig(scenario.InputGroup, &scenario.InputAlert)
+			if err != nil {
+				t.Fatalf("unexpected error: %s", err)
+			}
+			if got.WebhookURL != scenario.ExpectedOutput.WebhookURL {
+				t.Errorf("expected webhook URL to be %s, got %s", scenario.ExpectedOutput.WebhookURL, got.WebhookURL)
+			}
+			// Test ValidateOverrides as well, since it really just calls GetConfig
+			if err = scenario.Provider.ValidateOverrides(scenario.InputGroup, &scenario.InputAlert); err != nil {
+				t.Errorf("unexpected error: %s", err)
 			}
 		})
 	}

alerting/provider/gotify/gotify.go

@@ -3,6 +3,7 @@ package gotify
 import (
 	"bytes"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"io"
 	"net/http"
@@ -10,40 +11,72 @@ import (
 	"github.com/TwiN/gatus/v5/alerting/alert"
 	"github.com/TwiN/gatus/v5/client"
 	"github.com/TwiN/gatus/v5/config/endpoint"
+	"gopkg.in/yaml.v3"
 )
 
 const DefaultPriority = 5
 
+var (
+	ErrServerURLNotSet = errors.New("server URL not set")
+	ErrTokenNotSet     = errors.New("token not set")
+)
+
+type Config struct {
+	ServerURL string `yaml:"server-url"`         // URL of the Gotify server
+	Token     string `yaml:"token"`              // Token to use when sending a message to the Gotify server
+	Priority  int    `yaml:"priority,omitempty"` // Priority of the message. Defaults to DefaultPriority.
+	Title     string `yaml:"title,omitempty"`    // Title of the message that will be sent
+}
+
+func (cfg *Config) Validate() error {
+	if cfg.Priority == 0 {
+		cfg.Priority = DefaultPriority
+	}
+	if len(cfg.ServerURL) == 0 {
+		return ErrServerURLNotSet
+	}
+	if len(cfg.Token) == 0 {
+		return ErrTokenNotSet
+	}
+	return nil
+}
+
+func (cfg *Config) Merge(override *Config) {
+	if len(override.ServerURL) > 0 {
+		cfg.ServerURL = override.ServerURL
+	}
+	if len(override.Token) > 0 {
+		cfg.Token = override.Token
+	}
+	if override.Priority != 0 {
+		cfg.Priority = override.Priority
+	}
+	if len(override.Title) > 0 {
+		cfg.Title = override.Title
+	}
+}
+
 // AlertProvider is the configuration necessary for sending an alert using Gotify
 type AlertProvider struct {
-	// ServerURL is the URL of the Gotify server
-	ServerURL string `yaml:"server-url"`
-
-	// Token is the token to use when sending a message to the Gotify server
-	Token string `yaml:"token"`
-
-	// Priority is the priority of the message
-	Priority int `yaml:"priority,omitempty"` // Defaults to DefaultPriority
+	DefaultConfig Config `yaml:",inline"`
 
 	// DefaultAlert is the default alert configuration to use for endpoints with an alert of the appropriate type
 	DefaultAlert *alert.Alert `yaml:"default-alert,omitempty"`
-
-	// Title is the title of the message that will be sent
-	Title string `yaml:"title,omitempty"`
 }
 
-// IsValid returns whether the provider's configuration is valid
-func (provider *AlertProvider) IsValid() bool {
-	if provider.Priority == 0 {
-		provider.Priority = DefaultPriority
-	}
-	return len(provider.ServerURL) > 0 && len(provider.Token) > 0
+// Validate the provider's configuration
+func (provider *AlertProvider) Validate() error {
+	return provider.DefaultConfig.Validate()
 }
 
 // Send an alert using the provider
 func (provider *AlertProvider) Send(ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) error {
-	buffer := bytes.NewBuffer(provider.buildRequestBody(ep, alert, result, resolved))
-	request, err := http.NewRequest(http.MethodPost, provider.ServerURL+"/message?token="+provider.Token, buffer)
+	cfg, err := provider.GetConfig(ep.Group, alert)
+	if err != nil {
+		return err
+	}
+	buffer := bytes.NewBuffer(provider.buildRequestBody(cfg, ep, alert, result, resolved))
+	request, err := http.NewRequest(http.MethodPost, cfg.ServerURL+"/message?token="+cfg.Token, buffer)
 	if err != nil {
 		return err
 	}
@@ -67,7 +100,7 @@ type Body struct {
 }
 
 // buildRequestBody builds the request body for the provider
-func (provider *AlertProvider) buildRequestBody(ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) []byte {
+func (provider *AlertProvider) buildRequestBody(cfg *Config, ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) []byte {
 	var message string
 	if resolved {
 		message = fmt.Sprintf("An alert for `%s` has been resolved after passing successfully %d time(s) in a row", ep.DisplayName(), alert.SuccessThreshold)
@@ -89,13 +122,13 @@ func (provider *AlertProvider) buildRequestBody(ep *endpoint.Endpoint, alert *al
 	}
 	message += formattedConditionResults
 	title := "Gatus: " + ep.DisplayName()
-	if provider.Title != "" {
-		title = provider.Title
+	if cfg.Title != "" {
+		title = cfg.Title
 	}
 	bodyAsJSON, _ := json.Marshal(Body{
 		Message:  message,
 		Title:    title,
-		Priority: provider.Priority,
+		Priority: cfg.Priority,
 	})
 	return bodyAsJSON
 }
@@ -104,3 +137,25 @@ func (provider *AlertProvider) buildRequestBody(ep *endpoint.Endpoint, alert *al
 func (provider *AlertProvider) GetDefaultAlert() *alert.Alert {
 	return provider.DefaultAlert
 }
+
+// GetConfig returns the configuration for the provider with the overrides applied
+func (provider *AlertProvider) GetConfig(group string, alert *alert.Alert) (*Config, error) {
+	cfg := provider.DefaultConfig
+	// Handle alert overrides
+	if len(alert.ProviderOverride) != 0 {
+		overrideConfig := Config{}
+		if err := yaml.Unmarshal(alert.ProviderOverrideAsBytes(), &overrideConfig); err != nil {
+			return nil, err
+		}
+		cfg.Merge(&overrideConfig)
+	}
+	// Validate the configuration
+	err := cfg.Validate()
+	return &cfg, err
+}
+
+// ValidateOverrides validates the alert's provider override and, if present, the group override
+func (provider *AlertProvider) ValidateOverrides(group string, alert *alert.Alert) error {
+	_, err := provider.GetConfig(group, alert)
+	return err
+}

alerting/provider/gotify/gotify_test.go

@@ -9,7 +9,7 @@ import (
 	"github.com/TwiN/gatus/v5/config/endpoint"
 )
 
-func TestAlertProvider_IsValid(t *testing.T) {
+func TestAlertProvider_Validate(t *testing.T) {
 	scenarios := []struct {
 		name     string
 		provider AlertProvider
@@ -17,29 +17,29 @@ func TestAlertProvider_IsValid(t *testing.T) {
 	}{
 		{
 			name:     "valid",
-			provider: AlertProvider{ServerURL: "https://gotify.example.com", Token: "faketoken"},
+			provider: AlertProvider{DefaultConfig: Config{ServerURL: "https://gotify.example.com", Token: "faketoken"}},
 			expected: true,
 		},
 		{
 			name:     "invalid-server-url",
-			provider: AlertProvider{ServerURL: "", Token: "faketoken"},
+			provider: AlertProvider{DefaultConfig: Config{ServerURL: "", Token: "faketoken"}},
 			expected: false,
 		},
 		{
 			name:     "invalid-app-token",
-			provider: AlertProvider{ServerURL: "https://gotify.example.com", Token: ""},
+			provider: AlertProvider{DefaultConfig: Config{ServerURL: "https://gotify.example.com", Token: ""}},
 			expected: false,
 		},
 		{
 			name:     "no-priority-should-use-default-value",
-			provider: AlertProvider{ServerURL: "https://gotify.example.com", Token: "faketoken"},
+			provider: AlertProvider{DefaultConfig: Config{ServerURL: "https://gotify.example.com", Token: "faketoken"}},
 			expected: true,
 		},
 	}
 	for _, scenario := range scenarios {
 		t.Run(scenario.name, func(t *testing.T) {
-			if scenario.provider.IsValid() != scenario.expected {
-				t.Errorf("expected %t, got %t", scenario.expected, scenario.provider.IsValid())
+			if err := scenario.provider.Validate(); (err == nil) != scenario.expected {
+				t.Errorf("expected: %t, got: %t", scenario.expected, err == nil)
 			}
 		})
 	}
@@ -60,21 +60,21 @@ func TestAlertProvider_buildRequestBody(t *testing.T) {
 	}{
 		{
 			Name:         "triggered",
-			Provider:     AlertProvider{ServerURL: "https://gotify.example.com", Token: "faketoken"},
+			Provider:     AlertProvider{DefaultConfig: Config{ServerURL: "https://gotify.example.com", Token: "faketoken"}},
 			Alert:        alert.Alert{Description: &description, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved:     false,
 			ExpectedBody: fmt.Sprintf("{\"message\":\"An alert for `%s` has been triggered due to having failed 3 time(s) in a row with the following description: %s\\n✕ - [CONNECTED] == true\\n✕ - [STATUS] == 200\",\"title\":\"Gatus: custom-endpoint\",\"priority\":0}", endpointName, description),
 		},
 		{
 			Name:         "resolved",
-			Provider:     AlertProvider{ServerURL: "https://gotify.example.com", Token: "faketoken"},
+			Provider:     AlertProvider{DefaultConfig: Config{ServerURL: "https://gotify.example.com", Token: "faketoken"}},
 			Alert:        alert.Alert{Description: &description, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved:     true,
 			ExpectedBody: fmt.Sprintf("{\"message\":\"An alert for `%s` has been resolved after passing successfully 5 time(s) in a row with the following description: %s\\n✓ - [CONNECTED] == true\\n✓ - [STATUS] == 200\",\"title\":\"Gatus: custom-endpoint\",\"priority\":0}", endpointName, description),
 		},
 		{
 			Name:         "custom-title",
-			Provider:     AlertProvider{ServerURL: "https://gotify.example.com", Token: "faketoken", Title: "custom-title"},
+			Provider:     AlertProvider{DefaultConfig: Config{ServerURL: "https://gotify.example.com", Token: "faketoken", Title: "custom-title"}},
 			Alert:        alert.Alert{Description: &description, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved:     false,
 			ExpectedBody: fmt.Sprintf("{\"message\":\"An alert for `%s` has been triggered due to having failed 3 time(s) in a row with the following description: %s\\n✕ - [CONNECTED] == true\\n✕ - [STATUS] == 200\",\"title\":\"custom-title\",\"priority\":0}", endpointName, description),
@@ -83,6 +83,7 @@ func TestAlertProvider_buildRequestBody(t *testing.T) {
 	for _, scenario := range scenarios {
 		t.Run(scenario.Name, func(t *testing.T) {
 			body := scenario.Provider.buildRequestBody(
+				&scenario.Provider.DefaultConfig,
 				&endpoint.Endpoint{Name: endpointName},
 				&scenario.Alert,
 				&endpoint.Result{
@@ -103,3 +104,60 @@ func TestAlertProvider_buildRequestBody(t *testing.T) {
 		})
 	}
 }
+
+func TestAlertProvider_GetDefaultAlert(t *testing.T) {
+	provider := AlertProvider{DefaultAlert: &alert.Alert{}}
+	if provider.GetDefaultAlert() != provider.DefaultAlert {
+		t.Error("expected default alert to be returned")
+	}
+}
+
+func TestAlertProvider_GetConfig(t *testing.T) {
+	scenarios := []struct {
+		Name           string
+		Provider       AlertProvider
+		InputAlert     alert.Alert
+		ExpectedOutput Config
+	}{
+		{
+			Name: "provider-no-override-should-default",
+			Provider: AlertProvider{
+				DefaultConfig: Config{ServerURL: "https://gotify.example.com", Token: "12345"},
+			},
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{ServerURL: "https://gotify.example.com", Token: "12345", Priority: DefaultPriority},
+		},
+		{
+			Name: "provider-with-alert-override",
+			Provider: AlertProvider{
+				DefaultConfig: Config{ServerURL: "https://gotify.example.com", Token: "12345"},
+			},
+			InputAlert:     alert.Alert{ProviderOverride: map[string]any{"server-url": "https://gotify.group-example.com", "token": "54321", "title": "alert-title", "priority": 3}},
+			ExpectedOutput: Config{ServerURL: "https://gotify.group-example.com", Token: "54321", Title: "alert-title", Priority: 3},
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(scenario.Name, func(t *testing.T) {
+			got, err := scenario.Provider.GetConfig("", &scenario.InputAlert)
+			if err != nil {
+				t.Error("expected no error, got:", err.Error())
+			}
+			if got.ServerURL != scenario.ExpectedOutput.ServerURL {
+				t.Errorf("expected server URL to be %s, got %s", scenario.ExpectedOutput.ServerURL, got.ServerURL)
+			}
+			if got.Token != scenario.ExpectedOutput.Token {
+				t.Errorf("expected token to be %s, got %s", scenario.ExpectedOutput.Token, got.Token)
+			}
+			if got.Title != scenario.ExpectedOutput.Title {
+				t.Errorf("expected title to be %s, got %s", scenario.ExpectedOutput.Title, got.Title)
+			}
+			if got.Priority != scenario.ExpectedOutput.Priority {
+				t.Errorf("expected priority to be %d, got %d", scenario.ExpectedOutput.Priority, got.Priority)
+			}
+			// Test ValidateOverrides as well, since it really just calls GetConfig
+			if err = scenario.Provider.ValidateOverrides("", &scenario.InputAlert); err != nil {
+				t.Errorf("unexpected error: %s", err)
+			}
+		})
+	}
+}

alerting/provider/homeassistant/homeassistant.go

@@ -0,0 +1,196 @@
+package homeassistant
+
+import (
+	"bytes"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"net/http"
+
+	"github.com/TwiN/gatus/v5/alerting/alert"
+	"github.com/TwiN/gatus/v5/client"
+	"github.com/TwiN/gatus/v5/config/endpoint"
+	"gopkg.in/yaml.v3"
+)
+
+var (
+	ErrURLNotSet              = errors.New("url not set")
+	ErrTokenNotSet            = errors.New("token not set")
+	ErrDuplicateGroupOverride = errors.New("duplicate group override")
+)
+
+type Config struct {
+	URL   string `yaml:"url"`
+	Token string `yaml:"token"`
+}
+
+func (cfg *Config) Validate() error {
+	if len(cfg.URL) == 0 {
+		return ErrURLNotSet
+	}
+	if len(cfg.Token) == 0 {
+		return ErrTokenNotSet
+	}
+	return nil
+}
+
+func (cfg *Config) Merge(override *Config) {
+	if len(override.URL) > 0 {
+		cfg.URL = override.URL
+	}
+	if len(override.Token) > 0 {
+		cfg.Token = override.Token
+	}
+}
+
+// AlertProvider is the configuration necessary for sending an alert using HomeAssistant
+type AlertProvider struct {
+	DefaultConfig Config `yaml:",inline"`
+
+	// DefaultAlert is the default alert configuration to use for endpoints with an alert of the appropriate type
+	DefaultAlert *alert.Alert `yaml:"default-alert,omitempty"`
+
+	// Overrides is a list of Override that may be prioritized over the default configuration
+	Overrides []Override `yaml:"overrides,omitempty"`
+}
+
+// Override is a case under which the default integration is overridden
+type Override struct {
+	Group  string `yaml:"group"`
+	Config `yaml:",inline"`
+}
+
+// Validate the provider's configuration
+func (provider *AlertProvider) Validate() error {
+	registeredGroups := make(map[string]bool)
+	if provider.Overrides != nil {
+		for _, override := range provider.Overrides {
+			if isAlreadyRegistered := registeredGroups[override.Group]; isAlreadyRegistered || override.Group == "" {
+				return ErrDuplicateGroupOverride
+			}
+			registeredGroups[override.Group] = true
+		}
+	}
+	return provider.DefaultConfig.Validate()
+}
+
+// Send an alert using the provider
+func (provider *AlertProvider) Send(ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) error {
+	cfg, err := provider.GetConfig(ep.Group, alert)
+	if err != nil {
+		return err
+	}
+	buffer := bytes.NewBuffer(provider.buildRequestBody(ep, alert, result, resolved))
+	request, err := http.NewRequest(http.MethodPost, fmt.Sprintf("%s/api/events/gatus_alert", cfg.URL), buffer)
+	if err != nil {
+		return err
+	}
+	request.Header.Set("Content-Type", "application/json")
+	request.Header.Set("Authorization", "Bearer "+cfg.Token)
+	response, err := client.GetHTTPClient(nil).Do(request)
+	if err != nil {
+		return err
+	}
+	defer response.Body.Close()
+	if response.StatusCode > 399 {
+		body, _ := io.ReadAll(response.Body)
+		return fmt.Errorf("call to provider alert returned status code %d: %s", response.StatusCode, string(body))
+	}
+	return err
+}
+
+type Body struct {
+	EventType string `json:"event_type"`
+	EventData struct {
+		Status      string `json:"status"`
+		Endpoint    string `json:"endpoint"`
+		Description string `json:"description,omitempty"`
+		Conditions  []struct {
+			Condition string `json:"condition"`
+			Success   bool   `json:"success"`
+		} `json:"conditions,omitempty"`
+		FailureCount int `json:"failure_count,omitempty"`
+		SuccessCount int `json:"success_count,omitempty"`
+	} `json:"event_data"`
+}
+
+// buildRequestBody builds the request body for the provider
+func (provider *AlertProvider) buildRequestBody(ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) []byte {
+	body := Body{
+		EventType: "gatus_alert",
+		EventData: struct {
+			Status      string `json:"status"`
+			Endpoint    string `json:"endpoint"`
+			Description string `json:"description,omitempty"`
+			Conditions  []struct {
+				Condition string `json:"condition"`
+				Success   bool   `json:"success"`
+			} `json:"conditions,omitempty"`
+			FailureCount int `json:"failure_count,omitempty"`
+			SuccessCount int `json:"success_count,omitempty"`
+		}{
+			Status:   "resolved",
+			Endpoint: ep.DisplayName(),
+		},
+	}
+
+	if !resolved {
+		body.EventData.Status = "triggered"
+		body.EventData.FailureCount = alert.FailureThreshold
+	} else {
+		body.EventData.SuccessCount = alert.SuccessThreshold
+	}
+
+	if alertDescription := alert.GetDescription(); len(alertDescription) > 0 {
+		body.EventData.Description = alertDescription
+	}
+
+	if len(result.ConditionResults) > 0 {
+		for _, conditionResult := range result.ConditionResults {
+			body.EventData.Conditions = append(body.EventData.Conditions, struct {
+				Condition string `json:"condition"`
+				Success   bool   `json:"success"`
+			}{
+				Condition: conditionResult.Condition,
+				Success:   conditionResult.Success,
+			})
+		}
+	}
+
+	bodyAsJSON, _ := json.Marshal(body)
+	return bodyAsJSON
+}
+
+// GetDefaultAlert returns the provider's default alert configuration
+func (provider *AlertProvider) GetDefaultAlert() *alert.Alert {
+	return provider.DefaultAlert
+}
+
+// GetConfig returns the configuration for the provider with the overrides applied
+func (provider *AlertProvider) GetConfig(group string, alert *alert.Alert) (*Config, error) {
+	cfg := provider.DefaultConfig
+	if provider.Overrides != nil {
+		for _, override := range provider.Overrides {
+			if group == override.Group {
+				cfg.Merge(&override.Config)
+				break
+			}
+		}
+	}
+	if len(alert.ProviderOverride) != 0 {
+		overrideConfig := Config{}
+		if err := yaml.Unmarshal(alert.ProviderOverrideAsBytes(), &overrideConfig); err != nil {
+			return nil, err
+		}
+		cfg.Merge(&overrideConfig)
+	}
+	err := cfg.Validate()
+	return &cfg, err
+}
+
+// ValidateOverrides validates the alert's provider override and, if present, the group override
+func (provider *AlertProvider) ValidateOverrides(group string, alert *alert.Alert) error {
+	_, err := provider.GetConfig(group, alert)
+	return err
+}

alerting/provider/homeassistant/homeassistant_test.go

@@ -0,0 +1,158 @@
+package homeassistant
+
+import (
+	"encoding/json"
+	"net/http"
+	"testing"
+
+	"github.com/TwiN/gatus/v5/alerting/alert"
+	"github.com/TwiN/gatus/v5/client"
+	"github.com/TwiN/gatus/v5/config/endpoint"
+	"github.com/TwiN/gatus/v5/test"
+)
+
+func TestAlertProvider_Validate(t *testing.T) {
+	invalidProvider := AlertProvider{DefaultConfig: Config{URL: "", Token: ""}}
+	if err := invalidProvider.Validate(); err == nil {
+		t.Error("provider shouldn't have been valid")
+	}
+	invalidProviderNoToken := AlertProvider{DefaultConfig: Config{URL: "http://homeassistant:8123", Token: ""}}
+	if err := invalidProviderNoToken.Validate(); err == nil {
+		t.Error("provider shouldn't have been valid")
+	}
+	validProvider := AlertProvider{DefaultConfig: Config{URL: "http://homeassistant:8123", Token: "token"}}
+	if err := validProvider.Validate(); err != nil {
+		t.Error("provider should've been valid")
+	}
+}
+
+func TestAlertProvider_ValidateWithOverride(t *testing.T) {
+	providerWithInvalidOverrideGroup := AlertProvider{
+		Overrides: []Override{
+			{
+				Config: Config{URL: "http://homeassistant:8123", Token: "token"},
+				Group:  "",
+			},
+		},
+	}
+	if err := providerWithInvalidOverrideGroup.Validate(); err == nil {
+		t.Error("provider Group shouldn't have been valid")
+	}
+	providerWithValidOverride := AlertProvider{
+		DefaultConfig: Config{URL: "http://homeassistant:8123", Token: "token"},
+		Overrides: []Override{
+			{
+				Config: Config{URL: "http://homeassistant:8123", Token: "token"},
+				Group:  "group",
+			},
+		},
+	}
+	if err := providerWithValidOverride.Validate(); err != nil {
+		t.Error("provider should've been valid")
+	}
+}
+
+func TestAlertProvider_Send(t *testing.T) {
+	defer client.InjectHTTPClient(nil)
+	firstDescription := "description-1"
+	secondDescription := "description-2"
+	scenarios := []struct {
+		Name             string
+		Provider         AlertProvider
+		Alert            alert.Alert
+		Resolved         bool
+		MockRoundTripper test.MockRoundTripper
+		ExpectedError    bool
+	}{
+		{
+			Name:     "triggered",
+			Provider: AlertProvider{DefaultConfig: Config{URL: "http://homeassistant:8123", Token: "token"}},
+			Alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved: false,
+			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
+				return &http.Response{StatusCode: http.StatusOK, Body: http.NoBody}
+			}),
+			ExpectedError: false,
+		},
+		{
+			Name:     "triggered-error",
+			Provider: AlertProvider{DefaultConfig: Config{URL: "http://homeassistant:8123", Token: "token"}},
+			Alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved: false,
+			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
+				return &http.Response{StatusCode: http.StatusInternalServerError, Body: http.NoBody}
+			}),
+			ExpectedError: true,
+		},
+		{
+			Name:     "resolved",
+			Provider: AlertProvider{DefaultConfig: Config{URL: "http://homeassistant:8123", Token: "token"}},
+			Alert:    alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved: true,
+			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
+				return &http.Response{StatusCode: http.StatusOK, Body: http.NoBody}
+			}),
+			ExpectedError: false,
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(scenario.Name, func(t *testing.T) {
+			client.InjectHTTPClient(&http.Client{Transport: scenario.MockRoundTripper})
+			err := scenario.Provider.Send(
+				&endpoint.Endpoint{Name: "endpoint-name"},
+				&scenario.Alert,
+				&endpoint.Result{
+					ConditionResults: []*endpoint.ConditionResult{
+						{Condition: "SUCCESSFUL_CONDITION", Success: true},
+						{Condition: "FAILING_CONDITION", Success: false},
+					},
+				},
+				scenario.Resolved,
+			)
+			if scenario.ExpectedError && err == nil {
+				t.Error("expected error, got none")
+			}
+			if !scenario.ExpectedError && err != nil {
+				t.Error("expected no error, got", err.Error())
+			}
+		})
+	}
+}
+
+func TestAlertProvider_buildRequestBody(t *testing.T) {
+	description := "test-description"
+	provider := AlertProvider{DefaultConfig: Config{URL: "http://homeassistant:8123", Token: "token"}}
+	body := provider.buildRequestBody(
+		&endpoint.Endpoint{Name: "endpoint-name"},
+		&alert.Alert{Description: &description, SuccessThreshold: 5, FailureThreshold: 3},
+		&endpoint.Result{
+			ConditionResults: []*endpoint.ConditionResult{
+				{Condition: "SUCCESSFUL_CONDITION", Success: true},
+				{Condition: "FAILING_CONDITION", Success: false},
+			},
+		},
+		false,
+	)
+	var decodedBody Body
+	if err := json.Unmarshal(body, &decodedBody); err != nil {
+		t.Error("expected body to be valid JSON, got error:", err.Error())
+	}
+	if decodedBody.EventType != "gatus_alert" {
+		t.Errorf("expected event_type to be gatus_alert, got %s", decodedBody.EventType)
+	}
+	if decodedBody.EventData.Status != "triggered" {
+		t.Errorf("expected status to be triggered, got %s", decodedBody.EventData.Status)
+	}
+	if decodedBody.EventData.Description != description {
+		t.Errorf("expected description to be %s, got %s", description, decodedBody.EventData.Description)
+	}
+	if len(decodedBody.EventData.Conditions) != 2 {
+		t.Errorf("expected 2 conditions, got %d", len(decodedBody.EventData.Conditions))
+	}
+	if !decodedBody.EventData.Conditions[0].Success {
+		t.Error("expected first condition to be successful")
+	}
+	if decodedBody.EventData.Conditions[1].Success {
+		t.Error("expected second condition to be unsuccessful")
+	}
+}

alerting/provider/ifttt/ifttt.go

@@ -0,0 +1,187 @@
+package ifttt
+
+import (
+	"bytes"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"net/http"
+
+	"github.com/TwiN/gatus/v5/alerting/alert"
+	"github.com/TwiN/gatus/v5/client"
+	"github.com/TwiN/gatus/v5/config/endpoint"
+	"gopkg.in/yaml.v3"
+)
+
+var (
+	ErrWebhookKeyNotSet       = errors.New("webhook-key not set")
+	ErrEventNameNotSet        = errors.New("event-name not set")
+	ErrDuplicateGroupOverride = errors.New("duplicate group override")
+)
+
+type Config struct {
+	WebhookKey string `yaml:"webhook-key"` // IFTTT Webhook key
+	EventName  string `yaml:"event-name"`  // IFTTT event name
+}
+
+func (cfg *Config) Validate() error {
+	if len(cfg.WebhookKey) == 0 {
+		return ErrWebhookKeyNotSet
+	}
+	if len(cfg.EventName) == 0 {
+		return ErrEventNameNotSet
+	}
+	return nil
+}
+
+func (cfg *Config) Merge(override *Config) {
+	if len(override.WebhookKey) > 0 {
+		cfg.WebhookKey = override.WebhookKey
+	}
+	if len(override.EventName) > 0 {
+		cfg.EventName = override.EventName
+	}
+}
+
+// AlertProvider is the configuration necessary for sending an alert using IFTTT
+type AlertProvider struct {
+	DefaultConfig Config `yaml:",inline"`
+
+	// DefaultAlert is the default alert configuration to use for endpoints with an alert of the appropriate type
+	DefaultAlert *alert.Alert `yaml:"default-alert,omitempty"`
+
+	// Overrides is a list of Override that may be prioritized over the default configuration
+	Overrides []Override `yaml:"overrides,omitempty"`
+}
+
+// Override is a case under which the default integration is overridden
+type Override struct {
+	Group  string `yaml:"group"`
+	Config `yaml:",inline"`
+}
+
+// Validate the provider's configuration
+func (provider *AlertProvider) Validate() error {
+	registeredGroups := make(map[string]bool)
+	if provider.Overrides != nil {
+		for _, override := range provider.Overrides {
+			if isAlreadyRegistered := registeredGroups[override.Group]; isAlreadyRegistered || override.Group == "" {
+				return ErrDuplicateGroupOverride
+			}
+			registeredGroups[override.Group] = true
+		}
+	}
+	return provider.DefaultConfig.Validate()
+}
+
+// Send an alert using the provider
+func (provider *AlertProvider) Send(ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) error {
+	cfg, err := provider.GetConfig(ep.Group, alert)
+	if err != nil {
+		return err
+	}
+	url := fmt.Sprintf("https://maker.ifttt.com/trigger/%s/with/key/%s", cfg.EventName, cfg.WebhookKey)
+	body, err := provider.buildRequestBody(ep, alert, result, resolved)
+	if err != nil {
+		return err
+	}
+	buffer := bytes.NewBuffer(body)
+	request, err := http.NewRequest(http.MethodPost, url, buffer)
+	if err != nil {
+		return err
+	}
+	request.Header.Set("Content-Type", "application/json")
+	response, err := client.GetHTTPClient(nil).Do(request)
+	if err != nil {
+		return err
+	}
+	defer response.Body.Close()
+	if response.StatusCode >= 400 {
+		body, _ := io.ReadAll(response.Body)
+		return fmt.Errorf("call to ifttt alert returned status code %d: %s", response.StatusCode, string(body))
+	}
+	return err
+}
+
+type Body struct {
+	Value1 string `json:"value1"` // Alert status/title
+	Value2 string `json:"value2"` // Alert message
+	Value3 string `json:"value3"` // Additional details
+}
+
+// buildRequestBody builds the request body for the provider
+func (provider *AlertProvider) buildRequestBody(ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) ([]byte, error) {
+	var value1, value2, value3 string
+	if resolved {
+		value1 = fmt.Sprintf("✅ RESOLVED: %s", ep.DisplayName())
+		value2 = fmt.Sprintf("Alert has been resolved after passing successfully %d time(s) in a row", alert.SuccessThreshold)
+	} else {
+		value1 = fmt.Sprintf("🚨 ALERT: %s", ep.DisplayName())
+		value2 = fmt.Sprintf("Endpoint has failed %d time(s) in a row", alert.FailureThreshold)
+	}
+	// Build additional details
+	value3 = fmt.Sprintf("Endpoint: %s", ep.DisplayName())
+	if ep.Group != "" {
+		value3 += fmt.Sprintf(" | Group: %s", ep.Group)
+	}
+	if alertDescription := alert.GetDescription(); len(alertDescription) > 0 {
+		value3 += fmt.Sprintf(" | Description: %s", alertDescription)
+	}
+	// Add condition results summary
+	if len(result.ConditionResults) > 0 {
+		successCount := 0
+		for _, conditionResult := range result.ConditionResults {
+			if conditionResult.Success {
+				successCount++
+			}
+		}
+		value3 += fmt.Sprintf(" | Conditions: %d/%d passed", successCount, len(result.ConditionResults))
+	}
+	body := Body{
+		Value1: value1,
+		Value2: value2,
+		Value3: value3,
+	}
+	bodyAsJSON, err := json.Marshal(body)
+	if err != nil {
+		return nil, err
+	}
+	return bodyAsJSON, nil
+}
+
+// GetDefaultAlert returns the provider's default alert configuration
+func (provider *AlertProvider) GetDefaultAlert() *alert.Alert {
+	return provider.DefaultAlert
+}
+
+// GetConfig returns the configuration for the provider with the overrides applied
+func (provider *AlertProvider) GetConfig(group string, alert *alert.Alert) (*Config, error) {
+	cfg := provider.DefaultConfig
+	// Handle group overrides
+	if provider.Overrides != nil {
+		for _, override := range provider.Overrides {
+			if group == override.Group {
+				cfg.Merge(&override.Config)
+				break
+			}
+		}
+	}
+	// Handle alert overrides
+	if len(alert.ProviderOverride) != 0 {
+		overrideConfig := Config{}
+		if err := yaml.Unmarshal(alert.ProviderOverrideAsBytes(), &overrideConfig); err != nil {
+			return nil, err
+		}
+		cfg.Merge(&overrideConfig)
+	}
+	// Validate the configuration
+	err := cfg.Validate()
+	return &cfg, err
+}
+
+// ValidateOverrides validates the alert's provider override and, if present, the group override
+func (provider *AlertProvider) ValidateOverrides(group string, alert *alert.Alert) error {
+	_, err := provider.GetConfig(group, alert)
+	return err
+}

alerting/provider/ifttt/ifttt_test.go

@@ -0,0 +1,154 @@
+package ifttt
+
+import (
+	"encoding/json"
+	"net/http"
+	"strings"
+	"testing"
+
+	"github.com/TwiN/gatus/v5/alerting/alert"
+	"github.com/TwiN/gatus/v5/client"
+	"github.com/TwiN/gatus/v5/config/endpoint"
+	"github.com/TwiN/gatus/v5/test"
+)
+
+func TestAlertProvider_Validate(t *testing.T) {
+	scenarios := []struct {
+		name     string
+		provider AlertProvider
+		expected error
+	}{
+		{
+			name:     "valid",
+			provider: AlertProvider{DefaultConfig: Config{WebhookKey: "ifttt-webhook-key-123", EventName: "gatus_alert"}},
+			expected: nil,
+		},
+		{
+			name:     "invalid-webhook-key",
+			provider: AlertProvider{DefaultConfig: Config{EventName: "gatus_alert"}},
+			expected: ErrWebhookKeyNotSet,
+		},
+		{
+			name:     "invalid-event-name",
+			provider: AlertProvider{DefaultConfig: Config{WebhookKey: "ifttt-webhook-key-123"}},
+			expected: ErrEventNameNotSet,
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(scenario.name, func(t *testing.T) {
+			err := scenario.provider.Validate()
+			if err != scenario.expected {
+				t.Errorf("expected %v, got %v", scenario.expected, err)
+			}
+		})
+	}
+}
+
+func TestAlertProvider_Send(t *testing.T) {
+	defer client.InjectHTTPClient(nil)
+	firstDescription := "description-1"
+	secondDescription := "description-2"
+	scenarios := []struct {
+		name             string
+		provider         AlertProvider
+		alert            alert.Alert
+		resolved         bool
+		mockRoundTripper test.MockRoundTripper
+		expectedError    bool
+	}{
+		{
+			name:     "triggered",
+			provider: AlertProvider{DefaultConfig: Config{WebhookKey: "ifttt-webhook-key-123", EventName: "gatus_alert"}},
+			alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			resolved: false,
+			mockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
+				if r.Host != "maker.ifttt.com" {
+					t.Errorf("expected host maker.ifttt.com, got %s", r.Host)
+				}
+				if r.URL.Path != "/trigger/gatus_alert/with/key/ifttt-webhook-key-123" {
+					t.Errorf("expected path /trigger/gatus_alert/with/key/ifttt-webhook-key-123, got %s", r.URL.Path)
+				}
+				body := make(map[string]interface{})
+				json.NewDecoder(r.Body).Decode(&body)
+				value1 := body["value1"].(string)
+				if !strings.Contains(value1, "ALERT") {
+					t.Errorf("expected value1 to contain 'ALERT', got %s", value1)
+				}
+				value2 := body["value2"].(string)
+				if !strings.Contains(value2, "failed 3 time(s)") {
+					t.Errorf("expected value2 to contain failure count, got %s", value2)
+				}
+				value3 := body["value3"].(string)
+				if !strings.Contains(value3, "Endpoint: endpoint-name") {
+					t.Errorf("expected value3 to contain endpoint details, got %s", value3)
+				}
+				return &http.Response{StatusCode: http.StatusOK, Body: http.NoBody}
+			}),
+			expectedError: false,
+		},
+		{
+			name:     "resolved",
+			provider: AlertProvider{DefaultConfig: Config{WebhookKey: "ifttt-webhook-key-123", EventName: "gatus_resolved"}},
+			alert:    alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			resolved: true,
+			mockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
+				if r.URL.Path != "/trigger/gatus_resolved/with/key/ifttt-webhook-key-123" {
+					t.Errorf("expected path /trigger/gatus_resolved/with/key/ifttt-webhook-key-123, got %s", r.URL.Path)
+				}
+				body := make(map[string]interface{})
+				json.NewDecoder(r.Body).Decode(&body)
+				value1 := body["value1"].(string)
+				if !strings.Contains(value1, "RESOLVED") {
+					t.Errorf("expected value1 to contain 'RESOLVED', got %s", value1)
+				}
+				value3 := body["value3"].(string)
+				if !strings.Contains(value3, "Endpoint: endpoint-name") {
+					t.Errorf("expected value3 to contain endpoint details, got %s", value3)
+				}
+				return &http.Response{StatusCode: http.StatusOK, Body: http.NoBody}
+			}),
+			expectedError: false,
+		},
+		{
+			name:     "error-response",
+			provider: AlertProvider{DefaultConfig: Config{WebhookKey: "ifttt-webhook-key-123", EventName: "gatus_alert"}},
+			alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			resolved: false,
+			mockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
+				return &http.Response{StatusCode: http.StatusUnauthorized, Body: http.NoBody}
+			}),
+			expectedError: true,
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(scenario.name, func(t *testing.T) {
+			client.InjectHTTPClient(&http.Client{Transport: scenario.mockRoundTripper})
+			err := scenario.provider.Send(
+				&endpoint.Endpoint{Name: "endpoint-name"},
+				&scenario.alert,
+				&endpoint.Result{
+					ConditionResults: []*endpoint.ConditionResult{
+						{Condition: "[CONNECTED] == true", Success: scenario.resolved},
+						{Condition: "[STATUS] == 200", Success: scenario.resolved},
+					},
+				},
+				scenario.resolved,
+			)
+			if scenario.expectedError && err == nil {
+				t.Error("expected error, got none")
+			}
+			if !scenario.expectedError && err != nil {
+				t.Error("expected no error, got", err.Error())
+			}
+		})
+	}
+}
+
+func TestAlertProvider_GetDefaultAlert(t *testing.T) {
+	if (&AlertProvider{DefaultAlert: &alert.Alert{}}).GetDefaultAlert() == nil {
+		t.Error("expected default alert to be not nil")
+	}
+	if (&AlertProvider{DefaultAlert: nil}).GetDefaultAlert() != nil {
+		t.Error("expected default alert to be nil")
+	}
+}

alerting/provider/ilert/ilert.go

@@ -0,0 +1,168 @@
+package ilert
+
+import (
+	"bytes"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"net/http"
+
+	"github.com/TwiN/gatus/v5/alerting/alert"
+	"github.com/TwiN/gatus/v5/client"
+	"github.com/TwiN/gatus/v5/config/endpoint"
+	"gopkg.in/yaml.v3"
+)
+
+const (
+	restAPIUrl = "https://api.ilert.com/api/v1/events/gatus/"
+)
+
+var (
+	ErrIntegrationKeyNotSet   = errors.New("integration key is not set")
+	ErrDuplicateGroupOverride = errors.New("duplicate group override")
+)
+
+type Config struct {
+	IntegrationKey string `yaml:"integration-key"`
+}
+
+func (cfg *Config) Validate() error {
+	if len(cfg.IntegrationKey) == 0 {
+		return ErrIntegrationKeyNotSet
+	}
+	return nil
+}
+
+func (cfg *Config) Merge(override *Config) {
+	if len(override.IntegrationKey) > 0 {
+		cfg.IntegrationKey = override.IntegrationKey
+	}
+}
+
+// AlertProvider is the configuration necessary for sending an alert using ilert
+type AlertProvider struct {
+	DefaultConfig Config `yaml:",inline"`
+
+	// DefaultAlert is the default alert configuration to use for endpoints with an alert of the appropriate type
+	DefaultAlert *alert.Alert `yaml:"default-alert,omitempty"`
+
+	// Overrides is a list of Override that may be prioritized over the default configuration
+	Overrides []Override `yaml:"overrides,omitempty"`
+}
+
+type Override struct {
+	Group  string `yaml:"group"`
+	Config `yaml:",inline"`
+}
+
+func (provider *AlertProvider) Validate() error {
+	registeredGroups := make(map[string]bool)
+	if provider.Overrides != nil {
+		for _, override := range provider.Overrides {
+			if isAlreadyRegistered := registeredGroups[override.Group]; isAlreadyRegistered || override.Group == "" {
+				return ErrDuplicateGroupOverride
+			}
+			registeredGroups[override.Group] = true
+		}
+	}
+	return provider.DefaultConfig.Validate()
+}
+
+func (provider *AlertProvider) Send(ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) error {
+	cfg, err := provider.GetConfig(ep.Group, alert)
+	if err != nil {
+		return err
+	}
+	buffer := bytes.NewBuffer(provider.buildRequestBody(cfg, ep, alert, result, resolved))
+
+	req, err := http.NewRequest(http.MethodPost, fmt.Sprintf("%s%s", restAPIUrl, cfg.IntegrationKey), buffer)
+	if err != nil {
+		return err
+	}
+	req.Header.Set("Content-Type", "application/json")
+	response, err := client.GetHTTPClient(nil).Do(req)
+	if err != nil {
+		return err
+	}
+	defer response.Body.Close()
+	if response.StatusCode > 399 {
+		body, _ := io.ReadAll(response.Body)
+		return fmt.Errorf("call to provider alert returned status code %d: %s", response.StatusCode, string(body))
+	}
+
+	return err
+}
+
+type Body struct {
+	Alert            alert.Alert                 `json:"alert"`
+	Name             string                      `json:"name"`
+	Group            string                      `json:"group"`
+	Status           string                      `json:"status"`
+	Title            string                      `json:"title"`
+	Details          string                      `json:"details,omitempty"`
+	ConditionResults []*endpoint.ConditionResult `json:"condition_results"`
+	URL              string                      `json:"url"`
+}
+
+func (provider *AlertProvider) buildRequestBody(cfg *Config, ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) []byte {
+	var details, status string
+	if resolved {
+		status = "resolved"
+	} else {
+		status = "firing"
+	}
+
+	if len(alert.GetDescription()) > 0 {
+		details = alert.GetDescription()
+	} else {
+		details = "No description"
+	}
+
+	var body []byte
+	body, _ = json.Marshal(Body{
+		Alert:            *alert,
+		Name:             ep.Name,
+		Group:            ep.Group,
+		Title:            ep.DisplayName(),
+		Status:           status,
+		Details:          details,
+		ConditionResults: result.ConditionResults,
+		URL:              ep.URL,
+	})
+	return body
+}
+
+func (provider *AlertProvider) GetDefaultAlert() *alert.Alert {
+	return provider.DefaultAlert
+}
+
+func (provider *AlertProvider) GetConfig(group string, alert *alert.Alert) (*Config, error) {
+	cfg := provider.DefaultConfig
+	// Handle group overrides
+	if provider.Overrides != nil {
+		for _, override := range provider.Overrides {
+			if group == override.Group {
+				cfg.Merge(&override.Config)
+				break
+			}
+		}
+	}
+	// Handle alert overrides
+	if len(alert.ProviderOverride) != 0 {
+		overrideConfig := Config{}
+		if err := yaml.Unmarshal(alert.ProviderOverrideAsBytes(), &overrideConfig); err != nil {
+			return nil, err
+		}
+		cfg.Merge(&overrideConfig)
+	}
+	// Validate the configuration
+	err := cfg.Validate()
+	return &cfg, err
+}
+
+// ValidateOverrides validates the alert's provider override and, if present, the group override
+func (provider *AlertProvider) ValidateOverrides(group string, alert *alert.Alert) error {
+	_, err := provider.GetConfig(group, alert)
+	return err
+}

alerting/provider/ilert/ilert_test.go

@@ -0,0 +1,322 @@
+package ilert
+
+import (
+	"bytes"
+	"encoding/json"
+	"io"
+	"net/http"
+	"testing"
+
+	"github.com/TwiN/gatus/v5/alerting/alert"
+	"github.com/TwiN/gatus/v5/client"
+	"github.com/TwiN/gatus/v5/config/endpoint"
+	"github.com/TwiN/gatus/v5/test"
+)
+
+func TestAlertProvider_Validate(t *testing.T) {
+	scenarios := []struct {
+		name     string
+		provider AlertProvider
+		expected bool
+	}{
+		{
+			name: "valid",
+			provider: AlertProvider{
+				DefaultConfig: Config{
+					IntegrationKey: "some-random-key",
+				},
+			},
+			expected: true,
+		},
+		{
+			name: "invalid-integration-key",
+			provider: AlertProvider{
+				DefaultConfig: Config{
+					IntegrationKey: "",
+				},
+			},
+			expected: false,
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(scenario.name, func(t *testing.T) {
+			err := scenario.provider.Validate()
+			if scenario.expected && err != nil {
+				t.Error("expected no error, got", err.Error())
+			}
+			if !scenario.expected && err == nil {
+				t.Error("expected error, got none")
+			}
+		})
+	}
+}
+
+func TestAlertProvider_ValidateWithOverride(t *testing.T) {
+	providerWithInvalidOverrideGroup := AlertProvider{
+		DefaultConfig: Config{IntegrationKey: "00000000000000000000000000000001"},
+		Overrides: []Override{
+			{
+				Config: Config{IntegrationKey: "00000000000000000000000000000002"},
+				Group:  "",
+			},
+		},
+	}
+	if err := providerWithInvalidOverrideGroup.Validate(); err == nil {
+		t.Error("provider Group shouldn't have been valid")
+	}
+	providerWithValidOverride := AlertProvider{
+		DefaultConfig: Config{IntegrationKey: "00000000000000000000000000000001"},
+		Overrides: []Override{
+			{
+				Config: Config{IntegrationKey: "00000000000000000000000000000002"},
+				Group:  "group",
+			},
+		},
+	}
+	if err := providerWithValidOverride.Validate(); err != nil {
+		t.Error("provider should've been valid, got error:", err.Error())
+	}
+}
+
+func TestAlertProvider_Send(t *testing.T) {
+	defer client.InjectHTTPClient(nil)
+	firstDescription := "description-1"
+	secondDescription := "description-2"
+	sendOnResolved := true
+	scenarios := []struct {
+		Name             string
+		Provider         AlertProvider
+		Alert            alert.Alert
+		Resolved         bool
+		MockRoundTripper test.MockRoundTripper
+		ExpectedError    bool
+	}{
+		{
+			Name: "triggered",
+			Provider: AlertProvider{DefaultConfig: Config{
+				IntegrationKey: "some-integration-key",
+			}},
+			Alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 3, FailureThreshold: 3, ResolveKey: "123", Type: "ilert", SendOnResolved: &sendOnResolved},
+			Resolved: false,
+			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
+				var b bytes.Buffer
+
+				reader := io.NopCloser(&b)
+				return &http.Response{StatusCode: http.StatusAccepted, Body: reader}
+			}),
+			ExpectedError: false,
+		},
+		{
+			Name: "triggered-error",
+			Provider: AlertProvider{DefaultConfig: Config{
+				IntegrationKey: "some-integration-key",
+			}},
+			Alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 3, FailureThreshold: 3, ResolveKey: "123", Type: "ilert", SendOnResolved: &sendOnResolved},
+			Resolved: false,
+			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
+				return &http.Response{StatusCode: http.StatusBadRequest, Body: http.NoBody}
+			}),
+			ExpectedError: true,
+		},
+		{
+			Name: "resolved",
+			Provider: AlertProvider{DefaultConfig: Config{
+				IntegrationKey: "some-integration-key",
+			}},
+			Alert:    alert.Alert{Description: &secondDescription, SuccessThreshold: 3, FailureThreshold: 3, ResolveKey: "123", Type: "ilert", SendOnResolved: &sendOnResolved},
+			Resolved: true,
+			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
+				var b bytes.Buffer
+				reader := io.NopCloser(&b)
+				return &http.Response{StatusCode: http.StatusAccepted, Body: reader}
+			}),
+			ExpectedError: false,
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(scenario.Name, func(t *testing.T) {
+			client.InjectHTTPClient(&http.Client{Transport: scenario.MockRoundTripper})
+			err := scenario.Provider.Send(
+				&endpoint.Endpoint{Name: "endpoint-name"},
+				&scenario.Alert,
+				&endpoint.Result{
+					ConditionResults: []*endpoint.ConditionResult{
+						{Condition: "[CONNECTED] == true", Success: scenario.Resolved},
+						{Condition: "[STATUS] == 200", Success: scenario.Resolved},
+					},
+				},
+				scenario.Resolved,
+			)
+			if scenario.ExpectedError && err == nil {
+				t.Error("expected error, got none")
+			}
+			if !scenario.ExpectedError && err != nil {
+				t.Error("expected no error, got", err.Error())
+			}
+		})
+	}
+}
+
+func TestAlertProvider_BuildRequestBody(t *testing.T) {
+	firstDescription := "description-1"
+	secondDescription := "description-2"
+	sendOnResolved := true
+
+	scenarios := []struct {
+		Name         string
+		Provider     AlertProvider
+		Alert        alert.Alert
+		Resolved     bool
+		ExpectedBody string
+	}{
+		{
+			Name:         "triggered",
+			Provider:     AlertProvider{DefaultConfig: Config{IntegrationKey: "some-integration-key"}},
+			Alert:        alert.Alert{Description: &firstDescription, SuccessThreshold: 3, FailureThreshold: 3, ResolveKey: "123", Type: "ilert", SendOnResolved: &sendOnResolved},
+			Resolved:     false,
+			ExpectedBody: `{"alert":{"Type":"ilert","Enabled":null,"FailureThreshold":3,"SuccessThreshold":3,"MinimumReminderInterval":0,"Description":"description-1","SendOnResolved":true,"ProviderOverride":null,"ResolveKey":"123","Triggered":false},"name":"endpoint-name","group":"","status":"firing","title":"endpoint-name","details":"description-1","condition_results":[{"condition":"[CONNECTED] == true","success":false},{"condition":"[STATUS] == 200","success":false}],"url":""}`,
+		},
+		{
+			Name:         "resolved",
+			Provider:     AlertProvider{DefaultConfig: Config{IntegrationKey: "some-integration-key"}},
+			Alert:        alert.Alert{Description: &firstDescription, SuccessThreshold: 4, FailureThreshold: 3, ResolveKey: "123", Type: "ilert", SendOnResolved: &sendOnResolved},
+			Resolved:     true,
+			ExpectedBody: `{"alert":{"Type":"ilert","Enabled":null,"FailureThreshold":3,"SuccessThreshold":4,"MinimumReminderInterval":0,"Description":"description-1","SendOnResolved":true,"ProviderOverride":null,"ResolveKey":"123","Triggered":false},"name":"endpoint-name","group":"","status":"resolved","title":"endpoint-name","details":"description-1","condition_results":[{"condition":"[CONNECTED] == true","success":true},{"condition":"[STATUS] == 200","success":true}],"url":""}`,
+		},
+		{
+			Name:         "group-override",
+			Provider:     AlertProvider{DefaultConfig: Config{IntegrationKey: "some-integration-key"}, Overrides: []Override{{Group: "g", Config: Config{IntegrationKey: "different-integration-key"}}}},
+			Alert:        alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3, ResolveKey: "123", Type: "ilert", SendOnResolved: &sendOnResolved},
+			Resolved:     false,
+			ExpectedBody: `{"alert":{"Type":"ilert","Enabled":null,"FailureThreshold":3,"SuccessThreshold":5,"MinimumReminderInterval":0,"Description":"description-2","SendOnResolved":true,"ProviderOverride":null,"ResolveKey":"123","Triggered":false},"name":"endpoint-name","group":"","status":"firing","title":"endpoint-name","details":"description-2","condition_results":[{"condition":"[CONNECTED] == true","success":false},{"condition":"[STATUS] == 200","success":false}],"url":""}`,
+		},
+	}
+
+	for _, scenario := range scenarios {
+		t.Run(scenario.Name, func(t *testing.T) {
+			cfg, err := scenario.Provider.GetConfig("g", &scenario.Alert)
+			if err != nil {
+				t.Error("expected no error, got", err.Error())
+			}
+			body := scenario.Provider.buildRequestBody(
+				cfg,
+				&endpoint.Endpoint{Name: "endpoint-name"},
+				&scenario.Alert,
+				&endpoint.Result{
+					ConditionResults: []*endpoint.ConditionResult{
+						{Condition: "[CONNECTED] == true", Success: scenario.Resolved},
+						{Condition: "[STATUS] == 200", Success: scenario.Resolved},
+					},
+				},
+				scenario.Resolved,
+			)
+			if string(body) != scenario.ExpectedBody {
+				t.Errorf("expected:\n%s\ngot:\n%s", scenario.ExpectedBody, body)
+			}
+			out := make(map[string]interface{})
+			if err := json.Unmarshal(body, &out); err != nil {
+				t.Error("expected body to be valid JSON, got error:", err.Error())
+			}
+		})
+	}
+}
+
+func TestAlertProvider_GetDefaultAlert(t *testing.T) {
+	if (&AlertProvider{DefaultAlert: &alert.Alert{}}).GetDefaultAlert() == nil {
+		t.Error("expected default alert to be not nil")
+	}
+	if (&AlertProvider{DefaultAlert: nil}).GetDefaultAlert() != nil {
+		t.Error("expected default alert to be nil")
+	}
+}
+
+func TestAlertProvider_GetConfig(t *testing.T) {
+	scenarios := []struct {
+		Name           string
+		Provider       AlertProvider
+		InputGroup     string
+		InputAlert     alert.Alert
+		ExpectedOutput Config
+	}{
+		{
+			Name: "provider-no-override-specify-no-group-should-default",
+			Provider: AlertProvider{
+				DefaultConfig: Config{IntegrationKey: "00000000000000000000000000000001"},
+				Overrides:     nil,
+			},
+			InputGroup:     "",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{IntegrationKey: "00000000000000000000000000000001"},
+		},
+		{
+			Name: "provider-no-override-specify-group-should-default",
+			Provider: AlertProvider{
+				DefaultConfig: Config{IntegrationKey: "00000000000000000000000000000001"},
+				Overrides:     nil,
+			},
+			InputGroup:     "group",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{IntegrationKey: "00000000000000000000000000000001"},
+		},
+		{
+			Name: "provider-with-override-specify-no-group-should-default",
+			Provider: AlertProvider{
+				DefaultConfig: Config{IntegrationKey: "00000000000000000000000000000001"},
+				Overrides: []Override{
+					{
+						Group:  "group",
+						Config: Config{IntegrationKey: "00000000000000000000000000000002"},
+					},
+				},
+			},
+			InputGroup:     "",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{IntegrationKey: "00000000000000000000000000000001"},
+		},
+		{
+			Name: "provider-with-override-specify-group-should-override",
+			Provider: AlertProvider{
+				DefaultConfig: Config{IntegrationKey: "00000000000000000000000000000001"},
+				Overrides: []Override{
+					{
+						Group:  "group",
+						Config: Config{IntegrationKey: "00000000000000000000000000000002"},
+					},
+				},
+			},
+			InputGroup:     "group",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{IntegrationKey: "00000000000000000000000000000002"},
+		},
+		{
+			Name: "provider-with-group-override-and-alert-override--alert-override-should-take-precedence",
+			Provider: AlertProvider{
+				DefaultConfig: Config{IntegrationKey: "00000000000000000000000000000001"},
+				Overrides: []Override{
+					{
+						Group:  "group",
+						Config: Config{IntegrationKey: "00000000000000000000000000000002"},
+					},
+				},
+			},
+			InputGroup:     "group",
+			InputAlert:     alert.Alert{ProviderOverride: map[string]any{"integration-key": "00000000000000000000000000000003"}},
+			ExpectedOutput: Config{IntegrationKey: "00000000000000000000000000000003"},
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(scenario.Name, func(t *testing.T) {
+			got, err := scenario.Provider.GetConfig(scenario.InputGroup, &scenario.InputAlert)
+			if err != nil {
+				t.Fatalf("unexpected error: %s", err)
+			}
+			if got.IntegrationKey != scenario.ExpectedOutput.IntegrationKey {
+				t.Errorf("expected %s, got %s", scenario.ExpectedOutput.IntegrationKey, got.IntegrationKey)
+			}
+			// Test ValidateOverrides as well, since it really just calls GetConfig
+			if err = scenario.Provider.ValidateOverrides(scenario.InputGroup, &scenario.InputAlert); err != nil {
+				t.Errorf("unexpected error: %s", err)
+			}
+		})
+	}
+}

alerting/provider/incidentio/dedup.go

@@ -0,0 +1,18 @@
+package incidentio
+
+import (
+	"crypto/sha256"
+	"encoding/hex"
+	"fmt"
+	"time"
+
+	"github.com/TwiN/gatus/v5/alerting/alert"
+	"github.com/TwiN/gatus/v5/config/endpoint"
+)
+
+// generateDeduplicationKey generates a unique deduplication_key for incident.io
+func generateDeduplicationKey(ep *endpoint.Endpoint, alert *alert.Alert) string {
+	data := fmt.Sprintf("%s|%s|%s|%d", ep.Key(), alert.Type, alert.GetDescription(), time.Now().UnixNano())
+	hash := sha256.Sum256([]byte(data))
+	return hex.EncodeToString(hash[:])
+}

alerting/provider/incidentio/incidentio.go

@@ -0,0 +1,227 @@
+package incidentio
+
+import (
+	"bytes"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"net/http"
+	"strconv"
+	"strings"
+
+	"github.com/TwiN/gatus/v5/alerting/alert"
+	"github.com/TwiN/gatus/v5/client"
+	"github.com/TwiN/gatus/v5/config/endpoint"
+	"github.com/TwiN/logr"
+	"gopkg.in/yaml.v3"
+)
+
+const (
+	restAPIUrl = "https://api.incident.io/v2/alert_events/http/"
+)
+
+var (
+	ErrURLNotSet                    = errors.New("url not set")
+	ErrURLNotPrefixedWithRestAPIURL = fmt.Errorf("url must be prefixed with %s", restAPIUrl)
+	ErrDuplicateGroupOverride       = errors.New("duplicate group override")
+	ErrAuthTokenNotSet              = errors.New("auth-token not set")
+)
+
+type Config struct {
+	URL       string                 `yaml:"url,omitempty"`
+	AuthToken string                 `yaml:"auth-token,omitempty"`
+	SourceURL string                 `yaml:"source-url,omitempty"`
+	Metadata  map[string]interface{} `yaml:"metadata,omitempty"`
+}
+
+func (cfg *Config) Validate() error {
+	if len(cfg.URL) == 0 {
+		return ErrURLNotSet
+	}
+	if !strings.HasPrefix(cfg.URL, restAPIUrl) {
+		return ErrURLNotPrefixedWithRestAPIURL
+	}
+	if len(cfg.AuthToken) == 0 {
+		return ErrAuthTokenNotSet
+	}
+	return nil
+}
+
+func (cfg *Config) Merge(override *Config) {
+	if len(override.URL) > 0 {
+		cfg.URL = override.URL
+	}
+	if len(override.AuthToken) > 0 {
+		cfg.AuthToken = override.AuthToken
+	}
+	if len(override.SourceURL) > 0 {
+		cfg.SourceURL = override.SourceURL
+	}
+	if len(override.Metadata) > 0 {
+		cfg.Metadata = override.Metadata
+	}
+}
+
+// AlertProvider is the configuration necessary for sending an alert using incident.io
+type AlertProvider struct {
+	DefaultConfig Config `yaml:",inline"`
+
+	// DefaultAlert is the default alert configuration to use for endpoints with an alert of the appropriate type
+	DefaultAlert *alert.Alert `yaml:"default-alert,omitempty"`
+
+	// Overrides is a list of Override that may be prioritized over the default configuration
+	Overrides []Override `yaml:"overrides,omitempty"`
+}
+
+type Override struct {
+	Group  string `yaml:"group"`
+	Config `yaml:",inline"`
+}
+
+func (provider *AlertProvider) Validate() error {
+	registeredGroups := make(map[string]bool)
+	if provider.Overrides != nil {
+		for _, override := range provider.Overrides {
+			if isAlreadyRegistered := registeredGroups[override.Group]; isAlreadyRegistered || override.Group == "" {
+				return ErrDuplicateGroupOverride
+			}
+			registeredGroups[override.Group] = true
+		}
+	}
+	return provider.DefaultConfig.Validate()
+}
+
+func (provider *AlertProvider) Send(ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) error {
+	cfg, err := provider.GetConfig(ep.Group, alert)
+	if err != nil {
+		return err
+	}
+	buffer := bytes.NewBuffer(provider.buildRequestBody(cfg, ep, alert, result, resolved))
+	req, err := http.NewRequest(http.MethodPost, cfg.URL, buffer)
+	if err != nil {
+		return err
+	}
+	req.Header.Set("Content-Type", "application/json")
+	req.Header.Set("Authorization", "Bearer "+cfg.AuthToken)
+	response, err := client.GetHTTPClient(nil).Do(req)
+	if err != nil {
+		return err
+	}
+	defer response.Body.Close()
+	if response.StatusCode > 399 {
+		body, _ := io.ReadAll(response.Body)
+		return fmt.Errorf("call to provider alert returned status code %d: %s", response.StatusCode, string(body))
+	}
+	incidentioResponse := Response{}
+	err = json.NewDecoder(response.Body).Decode(&incidentioResponse)
+	if err != nil {
+		// Silently fail. We don't want to create tons of alerts just because we failed to parse the body.
+		logr.Errorf("[incidentio.Send] Ran into error decoding pagerduty response: %s", err.Error())
+	}
+	alert.ResolveKey = incidentioResponse.DeduplicationKey
+	return err
+}
+
+type Body struct {
+	AlertSourceConfigID string                 `json:"alert_source_config_id"`
+	Status              string                 `json:"status"`
+	Title               string                 `json:"title"`
+	DeduplicationKey    string                 `json:"deduplication_key,omitempty"`
+	Description         string                 `json:"description,omitempty"`
+	SourceURL           string                 `json:"source_url,omitempty"`
+	Metadata            map[string]interface{} `json:"metadata,omitempty"`
+}
+
+type Response struct {
+	DeduplicationKey string `json:"deduplication_key"`
+}
+
+func (provider *AlertProvider) buildRequestBody(cfg *Config, ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) []byte {
+	var message, formattedConditionResults, status string
+	if resolved {
+		message = "An alert has been resolved after passing successfully " + strconv.Itoa(alert.SuccessThreshold) + " time(s) in a row"
+		status = "resolved"
+	} else {
+		message = "An alert has been triggered due to having failed " + strconv.Itoa(alert.FailureThreshold) + " time(s) in a row"
+		status = "firing"
+	}
+	for _, conditionResult := range result.ConditionResults {
+		var prefix string
+		if conditionResult.Success {
+			prefix = "🟢"
+		} else {
+			prefix = "🔴"
+		}
+		formattedConditionResults += fmt.Sprintf(" %s %s ", prefix, conditionResult.Condition)
+	}
+	if len(alert.GetDescription()) > 0 {
+		message += " with the following description: " + alert.GetDescription()
+	}
+	message += fmt.Sprintf(" and the following conditions: %s ", formattedConditionResults)
+
+	// Generate deduplication key if empty (first firing)
+	if alert.ResolveKey == "" {
+		// Generate unique key (endpoint key, alert type, timestamp)
+		alert.ResolveKey = generateDeduplicationKey(ep, alert)
+	}
+	// Extract alert_source_config_id from URL
+	alertSourceID := strings.TrimPrefix(cfg.URL, restAPIUrl)
+	// Merge metadata: cfg.Metadata + ep.ExtraLabels (if present)
+	mergedMetadata := map[string]interface{}{}
+	// Copy cfg.Metadata
+	for k, v := range cfg.Metadata {
+		mergedMetadata[k] = v
+	}
+	// Add extra labels from endpoint (if present)
+	if ep.ExtraLabels != nil && len(ep.ExtraLabels) > 0 {
+		for k, v := range ep.ExtraLabels {
+			mergedMetadata[k] = v
+		}
+	}
+
+	body, _ := json.Marshal(Body{
+		AlertSourceConfigID: alertSourceID,
+		Title:               "Gatus: " + ep.DisplayName(),
+		Status:              status,
+		DeduplicationKey:    alert.ResolveKey,
+		Description:         message,
+		SourceURL:           cfg.SourceURL,
+		Metadata:            mergedMetadata,
+	})
+	fmt.Printf("%v", string(body))
+	return body
+}
+func (provider *AlertProvider) GetConfig(group string, alert *alert.Alert) (*Config, error) {
+	cfg := provider.DefaultConfig
+	// Handle group overrides
+	if provider.Overrides != nil {
+		for _, override := range provider.Overrides {
+			if group == override.Group {
+				cfg.Merge(&override.Config)
+				break
+			}
+		}
+	}
+	// Handle alert overrides
+	if len(alert.ProviderOverride) != 0 {
+		overrideConfig := Config{}
+		if err := yaml.Unmarshal(alert.ProviderOverrideAsBytes(), &overrideConfig); err != nil {
+			return nil, err
+		}
+		cfg.Merge(&overrideConfig)
+	}
+	// Validate the configuration
+	err := cfg.Validate()
+	return &cfg, err
+}
+
+// GetDefaultAlert returns the provider's default alert configuration
+func (provider *AlertProvider) GetDefaultAlert() *alert.Alert {
+	return provider.DefaultAlert
+}
+
+func (provider *AlertProvider) ValidateOverrides(group string, alert *alert.Alert) error {
+	_, err := provider.GetConfig(group, alert)
+	return err
+}

alerting/provider/incidentio/incidentio_test.go

@@ -0,0 +1,443 @@
+package incidentio
+
+import (
+	"bytes"
+	"encoding/json"
+	"io"
+	"net/http"
+	"testing"
+
+	"github.com/TwiN/gatus/v5/alerting/alert"
+	"github.com/TwiN/gatus/v5/client"
+	"github.com/TwiN/gatus/v5/config/endpoint"
+	"github.com/TwiN/gatus/v5/test"
+)
+
+func TestAlertProvider_Validate(t *testing.T) {
+	scenarios := []struct {
+		name     string
+		provider AlertProvider
+		expected bool
+	}{
+		{
+			name: "valid",
+			provider: AlertProvider{
+				DefaultConfig: Config{
+					URL:       "https://api.incident.io/v2/alert_events/http/some-id",
+					AuthToken: "some-token",
+				},
+			},
+			expected: true,
+		},
+		{
+			name: "invalid-url",
+			provider: AlertProvider{
+				DefaultConfig: Config{
+					URL:       "id-without-rest-api-url-as-prefix",
+					AuthToken: "some-token",
+				},
+			},
+			expected: false,
+		},
+		{
+			name: "invalid-missing-auth-token",
+			provider: AlertProvider{
+				DefaultConfig: Config{
+					URL: "some-id",
+				},
+			},
+			expected: false,
+		},
+		{
+			name: "invalid-missing-alert-source-config-id",
+			provider: AlertProvider{
+				DefaultConfig: Config{
+					AuthToken: "some-token",
+				},
+			},
+			expected: false,
+		},
+		{
+			name: "valid-override",
+			provider: AlertProvider{
+				DefaultConfig: Config{
+					AuthToken: "some-token",
+					URL:       "https://api.incident.io/v2/alert_events/http/some-id",
+				},
+				Overrides: []Override{{Group: "core", Config: Config{URL: "https://api.incident.io/v2/alert_events/http/another-id"}}},
+			},
+			expected: true,
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(scenario.name, func(t *testing.T) {
+			err := scenario.provider.Validate()
+			if scenario.expected && err != nil {
+				t.Error("expected no error, got", err.Error())
+			}
+			if !scenario.expected && err == nil {
+				t.Error("expected error, got none")
+			}
+		})
+	}
+}
+
+func TestAlertProvider_Send(t *testing.T) {
+	defer client.InjectHTTPClient(nil)
+	firstDescription := "description-1"
+	secondDescription := "description-2"
+	restAPIUrl := "https://api.incident.io/v2/alert_events/http/"
+	scenarios := []struct {
+		Name             string
+		Provider         AlertProvider
+		Alert            alert.Alert
+		Resolved         bool
+		MockRoundTripper test.MockRoundTripper
+		ExpectedError    bool
+	}{
+		{
+			Name: "triggered",
+			Provider: AlertProvider{DefaultConfig: Config{
+				URL:       restAPIUrl + "some-id",
+				AuthToken: "some-token",
+			}},
+			Alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved: false,
+			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
+				var b bytes.Buffer
+
+				response := Response{DeduplicationKey: "some-key"}
+				json.NewEncoder(&b).Encode(response)
+				reader := io.NopCloser(&b)
+				return &http.Response{StatusCode: http.StatusAccepted, Body: reader}
+			}),
+			ExpectedError: false,
+		},
+		{
+			Name: "triggered-error",
+			Provider: AlertProvider{DefaultConfig: Config{
+				URL:       restAPIUrl + "some-id",
+				AuthToken: "some-token",
+			}},
+			Alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved: false,
+			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
+				return &http.Response{StatusCode: http.StatusInternalServerError, Body: http.NoBody}
+			}),
+			ExpectedError: true,
+		},
+		{
+			Name: "resolved",
+			Provider: AlertProvider{DefaultConfig: Config{
+				URL:       restAPIUrl + "some-id",
+				AuthToken: "some-token",
+			}},
+			Alert:    alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved: true,
+			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
+				var b bytes.Buffer
+				response := Response{DeduplicationKey: "some-key"}
+				json.NewEncoder(&b).Encode(response)
+				reader := io.NopCloser(&b)
+				return &http.Response{StatusCode: http.StatusAccepted, Body: reader}
+			}),
+			ExpectedError: false,
+		},
+		{
+			Name:     "resolved-error",
+			Provider: AlertProvider{DefaultConfig: Config{}},
+			Alert:    alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved: true,
+			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
+				return &http.Response{StatusCode: http.StatusInternalServerError, Body: http.NoBody}
+			}),
+			ExpectedError: true,
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(scenario.Name, func(t *testing.T) {
+			client.InjectHTTPClient(&http.Client{Transport: scenario.MockRoundTripper})
+			err := scenario.Provider.Send(
+				&endpoint.Endpoint{Name: "endpoint-name"},
+				&scenario.Alert,
+				&endpoint.Result{
+					ConditionResults: []*endpoint.ConditionResult{
+						{Condition: "[CONNECTED] == true", Success: scenario.Resolved},
+						{Condition: "[STATUS] == 200", Success: scenario.Resolved},
+					},
+				},
+				scenario.Resolved,
+			)
+			if scenario.ExpectedError && err == nil {
+				t.Error("expected error, got none")
+			}
+			if !scenario.ExpectedError && err != nil {
+				t.Error("expected no error, got", err.Error())
+			}
+		})
+	}
+}
+
+func TestAlertProvider_BuildRequestBody(t *testing.T) {
+	firstDescription := "description-1"
+	secondDescription := "description-2"
+	restAPIUrl := "https://api.incident.io/v2/alert_events/http/"
+	scenarios := []struct {
+		Name                     string
+		Provider                 AlertProvider
+		Alert                    alert.Alert
+		Resolved                 bool
+		ExpectedAlertSourceID    string
+		ExpectedStatus           string
+		ExpectedTitle            string
+		ExpectedDescription      string
+		ExpectedSourceURL        string
+		ExpectedMetadata         map[string]interface{}
+		ShouldHaveDeduplicationKey bool
+	}{
+		{
+			Name:                     "triggered",
+			Provider:                 AlertProvider{DefaultConfig: Config{URL: restAPIUrl + "some-id", AuthToken: "some-token"}},
+			Alert:                    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved:                 false,
+			ExpectedAlertSourceID:    "some-id",
+			ExpectedStatus:           "firing",
+			ExpectedTitle:            "Gatus: endpoint-name",
+			ExpectedDescription:      "An alert has been triggered due to having failed 3 time(s) in a row with the following description: description-1 and the following conditions:  🔴 [CONNECTED] == true  🔴 [STATUS] == 200  ",
+			ShouldHaveDeduplicationKey: true,
+		},
+		{
+			Name:                     "resolved",
+			Provider:                 AlertProvider{DefaultConfig: Config{URL: restAPIUrl + "some-id", AuthToken: "some-token"}},
+			Alert:                    alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved:                 true,
+			ExpectedAlertSourceID:    "some-id",
+			ExpectedStatus:           "resolved",
+			ExpectedTitle:            "Gatus: endpoint-name",
+			ExpectedDescription:      "An alert has been resolved after passing successfully 5 time(s) in a row with the following description: description-2 and the following conditions:  🟢 [CONNECTED] == true  🟢 [STATUS] == 200  ",
+			ShouldHaveDeduplicationKey: true,
+		},
+		{
+			Name:                     "resolved-with-metadata-source-url",
+			Provider:                 AlertProvider{DefaultConfig: Config{URL: restAPIUrl + "some-id", AuthToken: "some-token", Metadata: map[string]interface{}{"service": "some-service", "team": "very-core"}, SourceURL: "some-source-url"}},
+			Alert:                    alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved:                 true,
+			ExpectedAlertSourceID:    "some-id",
+			ExpectedStatus:           "resolved",
+			ExpectedTitle:            "Gatus: endpoint-name",
+			ExpectedDescription:      "An alert has been resolved after passing successfully 5 time(s) in a row with the following description: description-2 and the following conditions:  🟢 [CONNECTED] == true  🟢 [STATUS] == 200  ",
+			ExpectedSourceURL:        "some-source-url",
+			ExpectedMetadata:         map[string]interface{}{"service": "some-service", "team": "very-core"},
+			ShouldHaveDeduplicationKey: true,
+		},
+		{
+			Name:                     "group-override",
+			Provider:                 AlertProvider{DefaultConfig: Config{URL: restAPIUrl + "some-id", AuthToken: "some-token"}, Overrides: []Override{{Group: "g", Config: Config{URL: restAPIUrl + "different-id", AuthToken: "some-token"}}}},
+			Alert:                    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved:                 false,
+			ExpectedAlertSourceID:    "different-id",
+			ExpectedStatus:           "firing",
+			ExpectedTitle:            "Gatus: endpoint-name",
+			ExpectedDescription:      "An alert has been triggered due to having failed 3 time(s) in a row with the following description: description-1 and the following conditions:  🔴 [CONNECTED] == true  🔴 [STATUS] == 200  ",
+			ShouldHaveDeduplicationKey: true,
+		},
+	}
+
+	for _, scenario := range scenarios {
+		t.Run(scenario.Name, func(t *testing.T) {
+			cfg, err := scenario.Provider.GetConfig("g", &scenario.Alert)
+			if err != nil {
+				t.Error("expected no error, got", err.Error())
+			}
+			body := scenario.Provider.buildRequestBody(
+				cfg,
+				&endpoint.Endpoint{Name: "endpoint-name"},
+				&scenario.Alert,
+				&endpoint.Result{
+					ConditionResults: []*endpoint.ConditionResult{
+						{Condition: "[CONNECTED] == true", Success: scenario.Resolved},
+						{Condition: "[STATUS] == 200", Success: scenario.Resolved},
+					},
+				},
+				scenario.Resolved,
+			)
+			
+			// Parse the JSON body
+			var parsedBody Body
+			if err := json.Unmarshal(body, &parsedBody); err != nil {
+				t.Error("expected body to be valid JSON, got error:", err.Error())
+			}
+			
+			// Validate individual fields
+			if parsedBody.AlertSourceConfigID != scenario.ExpectedAlertSourceID {
+				t.Errorf("expected alert_source_config_id to be %s, got %s", scenario.ExpectedAlertSourceID, parsedBody.AlertSourceConfigID)
+			}
+			if parsedBody.Status != scenario.ExpectedStatus {
+				t.Errorf("expected status to be %s, got %s", scenario.ExpectedStatus, parsedBody.Status)
+			}
+			if parsedBody.Title != scenario.ExpectedTitle {
+				t.Errorf("expected title to be %s, got %s", scenario.ExpectedTitle, parsedBody.Title)
+			}
+			if parsedBody.Description != scenario.ExpectedDescription {
+				t.Errorf("expected description to be %s, got %s", scenario.ExpectedDescription, parsedBody.Description)
+			}
+			if scenario.ExpectedSourceURL != "" && parsedBody.SourceURL != scenario.ExpectedSourceURL {
+				t.Errorf("expected source_url to be %s, got %s", scenario.ExpectedSourceURL, parsedBody.SourceURL)
+			}
+			if scenario.ExpectedMetadata != nil {
+				metadataJSON, _ := json.Marshal(parsedBody.Metadata)
+				expectedMetadataJSON, _ := json.Marshal(scenario.ExpectedMetadata)
+				if string(metadataJSON) != string(expectedMetadataJSON) {
+					t.Errorf("expected metadata to be %s, got %s", string(expectedMetadataJSON), string(metadataJSON))
+				}
+			}
+			// Validate that deduplication_key exists and is not empty
+			if scenario.ShouldHaveDeduplicationKey {
+				if parsedBody.DeduplicationKey == "" {
+					t.Error("expected deduplication_key to be present and non-empty")
+				}
+			}
+		})
+	}
+}
+
+func TestAlertProvider_GetDefaultAlert(t *testing.T) {
+	if (&AlertProvider{DefaultAlert: &alert.Alert{}}).GetDefaultAlert() == nil {
+		t.Error("expected default alert to be not nil")
+	}
+	if (&AlertProvider{DefaultAlert: nil}).GetDefaultAlert() != nil {
+		t.Error("expected default alert to be nil")
+	}
+}
+
+func TestAlertProvider_GetConfig(t *testing.T) {
+	scenarios := []struct {
+		Name           string
+		Provider       AlertProvider
+		InputGroup     string
+		InputAlert     alert.Alert
+		ExpectedOutput Config
+	}{
+		{
+			Name: "provider-no-override-specify-no-group-should-default",
+			Provider: AlertProvider{
+				DefaultConfig: Config{URL: "https://api.incident.io/v2/alert_events/http/some-id", AuthToken: "some-token"},
+				Overrides:     nil,
+			},
+			InputGroup:     "",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{URL: "https://api.incident.io/v2/alert_events/http/some-id", AuthToken: "some-token"},
+		},
+		{
+			Name: "provider-no-override-specify-group-should-default",
+			Provider: AlertProvider{
+				DefaultConfig: Config{URL: "https://api.incident.io/v2/alert_events/http/some-id", AuthToken: "some-token"},
+				Overrides:     nil,
+			},
+			InputGroup:     "group",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{URL: "https://api.incident.io/v2/alert_events/http/some-id", AuthToken: "some-token"},
+		},
+		{
+			Name: "provider-with-override-specify-no-group-should-default",
+			Provider: AlertProvider{
+				DefaultConfig: Config{URL: "https://api.incident.io/v2/alert_events/http/some-id", AuthToken: "some-token"},
+				Overrides: []Override{
+					{
+						Group:  "group",
+						Config: Config{URL: "https://api.incident.io/v2/alert_events/http/diff-id"},
+					},
+				},
+			},
+			InputGroup:     "",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{URL: "https://api.incident.io/v2/alert_events/http/some-id", AuthToken: "some-token"},
+		},
+		{
+			Name: "provider-with-override-specify-group-should-override",
+			Provider: AlertProvider{
+				DefaultConfig: Config{URL: "https://api.incident.io/v2/alert_events/http/some-id", AuthToken: "some-token"},
+				Overrides: []Override{
+					{
+						Group:  "group",
+						Config: Config{URL: "https://api.incident.io/v2/alert_events/http/diff-id", AuthToken: "some-token"},
+					},
+				},
+			},
+			InputGroup:     "group",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{URL: "https://api.incident.io/v2/alert_events/http/diff-id", AuthToken: "some-token"},
+		},
+		{
+			Name: "provider-with-group-override-and-alert-override--alert-override-should-take-precedence",
+			Provider: AlertProvider{
+				DefaultConfig: Config{URL: "https://api.incident.io/v2/alert_events/http/some-id", AuthToken: "some-token"},
+				Overrides: []Override{
+					{
+						Group:  "group",
+						Config: Config{URL: "https://api.incident.io/v2/alert_events/http/diff-id", AuthToken: "some-token"},
+					},
+				},
+			},
+			InputGroup:     "group",
+			InputAlert:     alert.Alert{ProviderOverride: map[string]any{"url": "https://api.incident.io/v2/alert_events/http/another-id"}},
+			ExpectedOutput: Config{URL: "https://api.incident.io/v2/alert_events/http/another-id", AuthToken: "some-token"},
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(scenario.Name, func(t *testing.T) {
+			got, err := scenario.Provider.GetConfig(scenario.InputGroup, &scenario.InputAlert)
+			if err != nil {
+				t.Fatalf("unexpected error: %s", err)
+			}
+			if got.URL != scenario.ExpectedOutput.URL {
+				t.Errorf("expected alert source config to be %s, got %s", scenario.ExpectedOutput.URL, got.URL)
+			}
+			if got.AuthToken != scenario.ExpectedOutput.AuthToken {
+				t.Errorf("expected alert auth token to be %s, got %s", scenario.ExpectedOutput.AuthToken, got.AuthToken)
+			}
+
+			// Test ValidateOverrides as well, since it really just calls GetConfig
+			if err = scenario.Provider.ValidateOverrides(scenario.InputGroup, &scenario.InputAlert); err != nil {
+				t.Errorf("unexpected error: %s", err)
+			}
+		})
+	}
+}
+
+func TestAlertProvider_ValidateWithOverride(t *testing.T) {
+	providerWithInvalidOverrideGroup := AlertProvider{
+		Overrides: []Override{
+			{
+				Config: Config{URL: "https://api.incident.io/v2/alert_events/http/some-id", AuthToken: "some-token"},
+				Group:  "",
+			},
+		},
+	}
+	if err := providerWithInvalidOverrideGroup.Validate(); err == nil {
+		t.Error("provider Group shouldn't have been valid")
+	}
+	providerWithInvalidOverrideTo := AlertProvider{
+		Overrides: []Override{
+			{
+				Config: Config{URL: "", AuthToken: "some-token"},
+				Group:  "group",
+			},
+		},
+	}
+	if err := providerWithInvalidOverrideTo.Validate(); err == nil {
+		t.Error("provider integration key shouldn't have been valid")
+	}
+	providerWithValidOverride := AlertProvider{
+		DefaultConfig: Config{URL: "https://api.incident.io/v2/alert_events/http/nice-id", AuthToken: "some-token"},
+		Overrides: []Override{
+			{
+				Config: Config{URL: "https://api.incident.io/v2/alert_events/http/very-good-id", AuthToken: "some-token"},
+				Group:  "group",
+			},
+		},
+	}
+	if err := providerWithValidOverride.Validate(); err != nil {
+		t.Error("provider should've been valid")
+	}
+}

alerting/provider/jetbrainsspace/jetbrainsspace.go

@@ -1,162 +0,0 @@
-package jetbrainsspace
-
-import (
-	"bytes"
-	"encoding/json"
-	"fmt"
-	"io"
-	"net/http"
-
-	"github.com/TwiN/gatus/v5/alerting/alert"
-	"github.com/TwiN/gatus/v5/client"
-	"github.com/TwiN/gatus/v5/config/endpoint"
-)
-
-// AlertProvider is the configuration necessary for sending an alert using JetBrains Space
-type AlertProvider struct {
-	Project   string `yaml:"project"`    // JetBrains Space Project name
-	ChannelID string `yaml:"channel-id"` // JetBrains Space Chat Channel ID
-	Token     string `yaml:"token"`      // JetBrains Space Bearer Token
-
-	// DefaultAlert is the default alert configuration to use for endpoints with an alert of the appropriate type
-	DefaultAlert *alert.Alert `yaml:"default-alert,omitempty"`
-
-	// Overrides is a list of Override that may be prioritized over the default configuration
-	Overrides []Override `yaml:"overrides,omitempty"`
-}
-
-// Override is a case under which the default integration is overridden
-type Override struct {
-	Group     string `yaml:"group"`
-	ChannelID string `yaml:"channel-id"`
-}
-
-// IsValid returns whether the provider's configuration is valid
-func (provider *AlertProvider) IsValid() bool {
-	registeredGroups := make(map[string]bool)
-	if provider.Overrides != nil {
-		for _, override := range provider.Overrides {
-			if isAlreadyRegistered := registeredGroups[override.Group]; isAlreadyRegistered || override.Group == "" || len(override.ChannelID) == 0 {
-				return false
-			}
-			registeredGroups[override.Group] = true
-		}
-	}
-	return len(provider.Project) > 0 && len(provider.ChannelID) > 0 && len(provider.Token) > 0
-}
-
-// Send an alert using the provider
-func (provider *AlertProvider) Send(ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) error {
-	buffer := bytes.NewBuffer(provider.buildRequestBody(ep, alert, result, resolved))
-	url := fmt.Sprintf("https://%s.jetbrains.space/api/http/chats/messages/send-message", provider.Project)
-	request, err := http.NewRequest(http.MethodPost, url, buffer)
-	if err != nil {
-		return err
-	}
-	request.Header.Set("Content-Type", "application/json")
-	request.Header.Set("Authorization", "Bearer "+provider.Token)
-	response, err := client.GetHTTPClient(nil).Do(request)
-	if err != nil {
-		return err
-	}
-	defer response.Body.Close()
-	if response.StatusCode > 399 {
-		body, _ := io.ReadAll(response.Body)
-		return fmt.Errorf("call to provider alert returned status code %d: %s", response.StatusCode, string(body))
-	}
-	return err
-}
-
-type Body struct {
-	Channel string  `json:"channel"`
-	Content Content `json:"content"`
-}
-
-type Content struct {
-	ClassName string    `json:"className"`
-	Style     string    `json:"style"`
-	Sections  []Section `json:"sections,omitempty"`
-}
-
-type Section struct {
-	ClassName string    `json:"className"`
-	Elements  []Element `json:"elements"`
-	Header    string    `json:"header"`
-}
-
-type Element struct {
-	ClassName string    `json:"className"`
-	Accessory Accessory `json:"accessory"`
-	Style     string    `json:"style"`
-	Size      string    `json:"size"`
-	Content   string    `json:"content"`
-}
-
-type Accessory struct {
-	ClassName string `json:"className"`
-	Icon      Icon   `json:"icon"`
-	Style     string `json:"style"`
-}
-
-type Icon struct {
-	Icon string `json:"icon"`
-}
-
-// buildRequestBody builds the request body for the provider
-func (provider *AlertProvider) buildRequestBody(ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) []byte {
-	body := Body{
-		Channel: "id:" + provider.getChannelIDForGroup(ep.Group),
-		Content: Content{
-			ClassName: "ChatMessage.Block",
-			Sections: []Section{{
-				ClassName: "MessageSection",
-				Elements:  []Element{},
-			}},
-		},
-	}
-	if resolved {
-		body.Content.Style = "SUCCESS"
-		body.Content.Sections[0].Header = fmt.Sprintf("An alert for *%s* has been resolved after passing successfully %d time(s) in a row", ep.DisplayName(), alert.SuccessThreshold)
-	} else {
-		body.Content.Style = "WARNING"
-		body.Content.Sections[0].Header = fmt.Sprintf("An alert for *%s* has been triggered due to having failed %d time(s) in a row", ep.DisplayName(), alert.FailureThreshold)
-	}
-	for _, conditionResult := range result.ConditionResults {
-		icon := "warning"
-		style := "WARNING"
-		if conditionResult.Success {
-			icon = "success"
-			style = "SUCCESS"
-		}
-		body.Content.Sections[0].Elements = append(body.Content.Sections[0].Elements, Element{
-			ClassName: "MessageText",
-			Accessory: Accessory{
-				ClassName: "MessageIcon",
-				Icon:      Icon{Icon: icon},
-				Style:     style,
-			},
-			Style:   style,
-			Size:    "REGULAR",
-			Content: conditionResult.Condition,
-		})
-	}
-	bodyAsJSON, _ := json.Marshal(body)
-	return bodyAsJSON
-}
-
-// getChannelIDForGroup returns the appropriate channel ID to for a given group override
-func (provider *AlertProvider) getChannelIDForGroup(group string) string {
-	if provider.Overrides != nil {
-		for _, override := range provider.Overrides {
-			if group == override.Group {
-				return override.ChannelID
-			}
-		}
-	}
-	return provider.ChannelID
-}
-
-// GetDefaultAlert returns the provider's default alert configuration
-func (provider *AlertProvider) GetDefaultAlert() *alert.Alert {
-	return provider.DefaultAlert
-}

alerting/provider/jetbrainsspace/jetbrainsspace_test.go

@@ -1,279 +0,0 @@
-package jetbrainsspace
-
-import (
-	"encoding/json"
-	"net/http"
-	"testing"
-
-	"github.com/TwiN/gatus/v5/alerting/alert"
-	"github.com/TwiN/gatus/v5/client"
-	"github.com/TwiN/gatus/v5/config/endpoint"
-	"github.com/TwiN/gatus/v5/test"
-)
-
-func TestAlertDefaultProvider_IsValid(t *testing.T) {
-	invalidProvider := AlertProvider{Project: ""}
-	if invalidProvider.IsValid() {
-		t.Error("provider shouldn't have been valid")
-	}
-	validProvider := AlertProvider{Project: "foo", ChannelID: "bar", Token: "baz"}
-	if !validProvider.IsValid() {
-		t.Error("provider should've been valid")
-	}
-}
-
-func TestAlertProvider_IsValidWithOverride(t *testing.T) {
-	providerWithInvalidOverrideGroup := AlertProvider{
-		Project: "foobar",
-		Overrides: []Override{
-			{
-				ChannelID: "http://example.com",
-				Group:     "",
-			},
-		},
-	}
-	if providerWithInvalidOverrideGroup.IsValid() {
-		t.Error("provider Group shouldn't have been valid")
-	}
-	providerWithInvalidOverrideTo := AlertProvider{
-		Project: "foobar",
-		Overrides: []Override{
-			{
-				ChannelID: "",
-				Group:     "group",
-			},
-		},
-	}
-	if providerWithInvalidOverrideTo.IsValid() {
-		t.Error("provider integration key shouldn't have been valid")
-	}
-	providerWithValidOverride := AlertProvider{
-		Project:   "foo",
-		ChannelID: "bar",
-		Token:     "baz",
-		Overrides: []Override{
-			{
-				ChannelID: "foobar",
-				Group:     "group",
-			},
-		},
-	}
-	if !providerWithValidOverride.IsValid() {
-		t.Error("provider should've been valid")
-	}
-}
-
-func TestAlertProvider_Send(t *testing.T) {
-	defer client.InjectHTTPClient(nil)
-	firstDescription := "description-1"
-	secondDescription := "description-2"
-	scenarios := []struct {
-		Name             string
-		Provider         AlertProvider
-		Alert            alert.Alert
-		Resolved         bool
-		MockRoundTripper test.MockRoundTripper
-		ExpectedError    bool
-	}{
-		{
-			Name:     "triggered",
-			Provider: AlertProvider{},
-			Alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
-			Resolved: false,
-			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
-				return &http.Response{StatusCode: http.StatusOK, Body: http.NoBody}
-			}),
-			ExpectedError: false,
-		},
-		{
-			Name:     "triggered-error",
-			Provider: AlertProvider{},
-			Alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
-			Resolved: false,
-			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
-				return &http.Response{StatusCode: http.StatusInternalServerError, Body: http.NoBody}
-			}),
-			ExpectedError: true,
-		},
-		{
-			Name:     "resolved",
-			Provider: AlertProvider{},
-			Alert:    alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
-			Resolved: true,
-			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
-				return &http.Response{StatusCode: http.StatusOK, Body: http.NoBody}
-			}),
-			ExpectedError: false,
-		},
-		{
-			Name:     "resolved-error",
-			Provider: AlertProvider{},
-			Alert:    alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
-			Resolved: true,
-			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
-				return &http.Response{StatusCode: http.StatusInternalServerError, Body: http.NoBody}
-			}),
-			ExpectedError: true,
-		},
-	}
-	for _, scenario := range scenarios {
-		t.Run(scenario.Name, func(t *testing.T) {
-			client.InjectHTTPClient(&http.Client{Transport: scenario.MockRoundTripper})
-			err := scenario.Provider.Send(
-				&endpoint.Endpoint{Name: "endpoint-name"},
-				&scenario.Alert,
-				&endpoint.Result{
-					ConditionResults: []*endpoint.ConditionResult{
-						{Condition: "[CONNECTED] == true", Success: scenario.Resolved},
-						{Condition: "[STATUS] == 200", Success: scenario.Resolved},
-					},
-				},
-				scenario.Resolved,
-			)
-			if scenario.ExpectedError && err == nil {
-				t.Error("expected error, got none")
-			}
-			if !scenario.ExpectedError && err != nil {
-				t.Error("expected no error, got", err.Error())
-			}
-		})
-	}
-}
-
-func TestAlertProvider_buildRequestBody(t *testing.T) {
-	firstDescription := "description-1"
-	secondDescription := "description-2"
-	scenarios := []struct {
-		Name         string
-		Provider     AlertProvider
-		Endpoint     endpoint.Endpoint
-		Alert        alert.Alert
-		Resolved     bool
-		ExpectedBody string
-	}{
-		{
-			Name:         "triggered",
-			Provider:     AlertProvider{},
-			Endpoint:     endpoint.Endpoint{Name: "name"},
-			Alert:        alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
-			Resolved:     false,
-			ExpectedBody: `{"channel":"id:","content":{"className":"ChatMessage.Block","style":"WARNING","sections":[{"className":"MessageSection","elements":[{"className":"MessageText","accessory":{"className":"MessageIcon","icon":{"icon":"warning"},"style":"WARNING"},"style":"WARNING","size":"REGULAR","content":"[CONNECTED] == true"},{"className":"MessageText","accessory":{"className":"MessageIcon","icon":{"icon":"warning"},"style":"WARNING"},"style":"WARNING","size":"REGULAR","content":"[STATUS] == 200"}],"header":"An alert for *name* has been triggered due to having failed 3 time(s) in a row"}]}}`,
-		},
-		{
-			Name:         "triggered-with-group",
-			Provider:     AlertProvider{},
-			Endpoint:     endpoint.Endpoint{Name: "name", Group: "group"},
-			Alert:        alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
-			Resolved:     false,
-			ExpectedBody: `{"channel":"id:","content":{"className":"ChatMessage.Block","style":"WARNING","sections":[{"className":"MessageSection","elements":[{"className":"MessageText","accessory":{"className":"MessageIcon","icon":{"icon":"warning"},"style":"WARNING"},"style":"WARNING","size":"REGULAR","content":"[CONNECTED] == true"},{"className":"MessageText","accessory":{"className":"MessageIcon","icon":{"icon":"warning"},"style":"WARNING"},"style":"WARNING","size":"REGULAR","content":"[STATUS] == 200"}],"header":"An alert for *group/name* has been triggered due to having failed 3 time(s) in a row"}]}}`,
-		},
-		{
-			Name:         "resolved",
-			Provider:     AlertProvider{},
-			Endpoint:     endpoint.Endpoint{Name: "name"},
-			Alert:        alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
-			Resolved:     true,
-			ExpectedBody: `{"channel":"id:","content":{"className":"ChatMessage.Block","style":"SUCCESS","sections":[{"className":"MessageSection","elements":[{"className":"MessageText","accessory":{"className":"MessageIcon","icon":{"icon":"success"},"style":"SUCCESS"},"style":"SUCCESS","size":"REGULAR","content":"[CONNECTED] == true"},{"className":"MessageText","accessory":{"className":"MessageIcon","icon":{"icon":"success"},"style":"SUCCESS"},"style":"SUCCESS","size":"REGULAR","content":"[STATUS] == 200"}],"header":"An alert for *name* has been resolved after passing successfully 5 time(s) in a row"}]}}`,
-		},
-		{
-			Name:         "resolved-with-group",
-			Provider:     AlertProvider{},
-			Endpoint:     endpoint.Endpoint{Name: "name", Group: "group"},
-			Alert:        alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
-			Resolved:     true,
-			ExpectedBody: `{"channel":"id:","content":{"className":"ChatMessage.Block","style":"SUCCESS","sections":[{"className":"MessageSection","elements":[{"className":"MessageText","accessory":{"className":"MessageIcon","icon":{"icon":"success"},"style":"SUCCESS"},"style":"SUCCESS","size":"REGULAR","content":"[CONNECTED] == true"},{"className":"MessageText","accessory":{"className":"MessageIcon","icon":{"icon":"success"},"style":"SUCCESS"},"style":"SUCCESS","size":"REGULAR","content":"[STATUS] == 200"}],"header":"An alert for *group/name* has been resolved after passing successfully 5 time(s) in a row"}]}}`,
-		},
-	}
-	for _, scenario := range scenarios {
-		t.Run(scenario.Name, func(t *testing.T) {
-			body := scenario.Provider.buildRequestBody(
-				&scenario.Endpoint,
-				&scenario.Alert,
-				&endpoint.Result{
-					ConditionResults: []*endpoint.ConditionResult{
-						{Condition: "[CONNECTED] == true", Success: scenario.Resolved},
-						{Condition: "[STATUS] == 200", Success: scenario.Resolved},
-					},
-				},
-				scenario.Resolved,
-			)
-			if string(body) != scenario.ExpectedBody {
-				t.Errorf("expected:\n%s\ngot:\n%s", scenario.ExpectedBody, body)
-			}
-			out := make(map[string]interface{})
-			if err := json.Unmarshal(body, &out); err != nil {
-				t.Error("expected body to be valid JSON, got error:", err.Error())
-			}
-		})
-	}
-}
-
-func TestAlertProvider_GetDefaultAlert(t *testing.T) {
-	if (&AlertProvider{DefaultAlert: &alert.Alert{}}).GetDefaultAlert() == nil {
-		t.Error("expected default alert to be not nil")
-	}
-	if (&AlertProvider{DefaultAlert: nil}).GetDefaultAlert() != nil {
-		t.Error("expected default alert to be nil")
-	}
-}
-
-func TestAlertProvider_getChannelIDForGroup(t *testing.T) {
-	tests := []struct {
-		Name           string
-		Provider       AlertProvider
-		InputGroup     string
-		ExpectedOutput string
-	}{
-		{
-			Name: "provider-no-override-specify-no-group-should-default",
-			Provider: AlertProvider{
-				ChannelID: "bar",
-			},
-			InputGroup:     "",
-			ExpectedOutput: "bar",
-		},
-		{
-			Name: "provider-no-override-specify-group-should-default",
-			Provider: AlertProvider{
-				ChannelID: "bar",
-			},
-			InputGroup:     "group",
-			ExpectedOutput: "bar",
-		},
-		{
-			Name: "provider-with-override-specify-no-group-should-default",
-			Provider: AlertProvider{
-				ChannelID: "bar",
-				Overrides: []Override{
-					{
-						Group:     "group",
-						ChannelID: "foobar",
-					},
-				},
-			},
-			InputGroup:     "",
-			ExpectedOutput: "bar",
-		},
-		{
-			Name: "provider-with-override-specify-group-should-override",
-			Provider: AlertProvider{
-				ChannelID: "bar",
-				Overrides: []Override{
-					{
-						Group:     "group",
-						ChannelID: "foobar",
-					},
-				},
-			},
-			InputGroup:     "group",
-			ExpectedOutput: "foobar",
-		},
-	}
-	for _, tt := range tests {
-		t.Run(tt.Name, func(t *testing.T) {
-			if got := tt.Provider.getChannelIDForGroup(tt.InputGroup); got != tt.ExpectedOutput {
-				t.Errorf("AlertProvider.getChannelIDForGroup() = %v, want %v", got, tt.ExpectedOutput)
-			}
-		})
-	}
-}

alerting/provider/line/line.go

@@ -0,0 +1,193 @@
+package line
+
+import (
+	"bytes"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"net/http"
+
+	"github.com/TwiN/gatus/v5/alerting/alert"
+	"github.com/TwiN/gatus/v5/client"
+	"github.com/TwiN/gatus/v5/config/endpoint"
+	"gopkg.in/yaml.v3"
+)
+
+var (
+	ErrChannelAccessTokenNotSet = errors.New("channel-access-token not set")
+	ErrUserIDsNotSet            = errors.New("user-ids not set")
+	ErrDuplicateGroupOverride   = errors.New("duplicate group override")
+)
+
+type Config struct {
+	ChannelAccessToken string   `yaml:"channel-access-token"` // Line Messaging API channel access token
+	UserIDs            []string `yaml:"user-ids"`             // List of Line user IDs to send messages to
+}
+
+func (cfg *Config) Validate() error {
+	if len(cfg.ChannelAccessToken) == 0 {
+		return ErrChannelAccessTokenNotSet
+	}
+	if len(cfg.UserIDs) == 0 {
+		return ErrUserIDsNotSet
+	}
+	return nil
+}
+
+func (cfg *Config) Merge(override *Config) {
+	if len(override.ChannelAccessToken) > 0 {
+		cfg.ChannelAccessToken = override.ChannelAccessToken
+	}
+	if len(override.UserIDs) > 0 {
+		cfg.UserIDs = override.UserIDs
+	}
+}
+
+// AlertProvider is the configuration necessary for sending an alert using Line
+type AlertProvider struct {
+	DefaultConfig Config `yaml:",inline"`
+
+	// DefaultAlert is the default alert configuration to use for endpoints with an alert of the appropriate type
+	DefaultAlert *alert.Alert `yaml:"default-alert,omitempty"`
+
+	// Overrides is a list of Override that may be prioritized over the default configuration
+	Overrides []Override `yaml:"overrides,omitempty"`
+}
+
+// Override is a case under which the default integration is overridden
+type Override struct {
+	Group  string `yaml:"group"`
+	Config `yaml:",inline"`
+}
+
+// Validate the provider's configuration
+func (provider *AlertProvider) Validate() error {
+	registeredGroups := make(map[string]bool)
+	if provider.Overrides != nil {
+		for _, override := range provider.Overrides {
+			if isAlreadyRegistered := registeredGroups[override.Group]; isAlreadyRegistered || override.Group == "" {
+				return ErrDuplicateGroupOverride
+			}
+			registeredGroups[override.Group] = true
+		}
+	}
+	return provider.DefaultConfig.Validate()
+}
+
+// Send an alert using the provider
+func (provider *AlertProvider) Send(ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) error {
+	cfg, err := provider.GetConfig(ep.Group, alert)
+	if err != nil {
+		return err
+	}
+	for _, userID := range cfg.UserIDs {
+		body, err := provider.buildRequestBody(ep, alert, result, resolved, userID)
+		if err != nil {
+			return err
+		}
+		buffer := bytes.NewBuffer(body)
+		request, err := http.NewRequest(http.MethodPost, "https://api.line.me/v2/bot/message/push", buffer)
+		if err != nil {
+			return err
+		}
+		request.Header.Set("Content-Type", "application/json")
+		request.Header.Set("Authorization", fmt.Sprintf("Bearer %s", cfg.ChannelAccessToken))
+		response, err := client.GetHTTPClient(nil).Do(request)
+		if err != nil {
+			return err
+		}
+		if response.StatusCode >= 400 {
+			body, _ := io.ReadAll(response.Body)
+			response.Body.Close()
+			return fmt.Errorf("call to line alert returned status code %d: %s", response.StatusCode, string(body))
+		}
+		response.Body.Close()
+	}
+	return nil
+}
+
+type Body struct {
+	To       string    `json:"to"`
+	Messages []Message `json:"messages"`
+}
+
+type Message struct {
+	Type string `json:"type"`
+	Text string `json:"text"`
+}
+
+// buildRequestBody builds the request body for the provider
+func (provider *AlertProvider) buildRequestBody(ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool, userID string) ([]byte, error) {
+	var message string
+	if resolved {
+		message = fmt.Sprintf("✅ RESOLVED: %s\n\nAlert has been resolved after passing successfully %d time(s) in a row", ep.DisplayName(), alert.SuccessThreshold)
+	} else {
+		message = fmt.Sprintf("⚠️ ALERT: %s\n\nEndpoint has failed %d time(s) in a row", ep.DisplayName(), alert.FailureThreshold)
+	}
+	if alertDescription := alert.GetDescription(); len(alertDescription) > 0 {
+		message += fmt.Sprintf("\n\nDescription: %s", alertDescription)
+	}
+	if len(result.ConditionResults) > 0 {
+		message += "\n\nCondition Results:"
+		for _, conditionResult := range result.ConditionResults {
+			var status string
+			if conditionResult.Success {
+				status = "✅"
+			} else {
+				status = "❌"
+			}
+			message += fmt.Sprintf("\n%s %s", status, conditionResult.Condition)
+		}
+	}
+	body := Body{
+		To: userID,
+		Messages: []Message{
+			{
+				Type: "text",
+				Text: message,
+			},
+		},
+	}
+	bodyAsJSON, err := json.Marshal(body)
+	if err != nil {
+		return nil, err
+	}
+	return bodyAsJSON, nil
+}
+
+// GetDefaultAlert returns the provider's default alert configuration
+func (provider *AlertProvider) GetDefaultAlert() *alert.Alert {
+	return provider.DefaultAlert
+}
+
+// GetConfig returns the configuration for the provider with the overrides applied
+func (provider *AlertProvider) GetConfig(group string, alert *alert.Alert) (*Config, error) {
+	cfg := provider.DefaultConfig
+	// Handle group overrides
+	if provider.Overrides != nil {
+		for _, override := range provider.Overrides {
+			if group == override.Group {
+				cfg.Merge(&override.Config)
+				break
+			}
+		}
+	}
+	// Handle alert overrides
+	if len(alert.ProviderOverride) != 0 {
+		overrideConfig := Config{}
+		if err := yaml.Unmarshal(alert.ProviderOverrideAsBytes(), &overrideConfig); err != nil {
+			return nil, err
+		}
+		cfg.Merge(&overrideConfig)
+	}
+	// Validate the configuration
+	err := cfg.Validate()
+	return &cfg, err
+}
+
+// ValidateOverrides validates the alert's provider override and, if present, the group override
+func (provider *AlertProvider) ValidateOverrides(group string, alert *alert.Alert) error {
+	_, err := provider.GetConfig(group, alert)
+	return err
+}

alerting/provider/line/line_test.go

@@ -0,0 +1,147 @@
+package line
+
+import (
+	"encoding/json"
+	"net/http"
+	"testing"
+
+	"github.com/TwiN/gatus/v5/alerting/alert"
+	"github.com/TwiN/gatus/v5/client"
+	"github.com/TwiN/gatus/v5/config/endpoint"
+	"github.com/TwiN/gatus/v5/test"
+)
+
+func TestAlertProvider_Validate(t *testing.T) {
+	scenarios := []struct {
+		name     string
+		provider AlertProvider
+		expected error
+	}{
+		{
+			name:     "valid",
+			provider: AlertProvider{DefaultConfig: Config{ChannelAccessToken: "token123", UserIDs: []string{"U123"}}},
+			expected: nil,
+		},
+		{
+			name:     "invalid-channel-access-token",
+			provider: AlertProvider{DefaultConfig: Config{UserIDs: []string{"U123"}}},
+			expected: ErrChannelAccessTokenNotSet,
+		},
+		{
+			name:     "invalid-user-ids",
+			provider: AlertProvider{DefaultConfig: Config{ChannelAccessToken: "token123"}},
+			expected: ErrUserIDsNotSet,
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(scenario.name, func(t *testing.T) {
+			err := scenario.provider.Validate()
+			if err != scenario.expected {
+				t.Errorf("expected %v, got %v", scenario.expected, err)
+			}
+		})
+	}
+}
+
+func TestAlertProvider_Send(t *testing.T) {
+	defer client.InjectHTTPClient(nil)
+	firstDescription := "description-1"
+	secondDescription := "description-2"
+	scenarios := []struct {
+		name             string
+		provider         AlertProvider
+		alert            alert.Alert
+		resolved         bool
+		mockRoundTripper test.MockRoundTripper
+		expectedError    bool
+	}{
+		{
+			name:     "triggered",
+			provider: AlertProvider{DefaultConfig: Config{ChannelAccessToken: "token123", UserIDs: []string{"U123", "U456"}}},
+			alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			resolved: false,
+			mockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
+				if r.URL.Path != "/v2/bot/message/push" {
+					t.Errorf("expected path /v2/bot/message/push, got %s", r.URL.Path)
+				}
+				if r.Header.Get("Authorization") != "Bearer token123" {
+					t.Errorf("expected Authorization header to be 'Bearer token123', got %s", r.Header.Get("Authorization"))
+				}
+				body := make(map[string]interface{})
+				json.NewDecoder(r.Body).Decode(&body)
+				if body["to"] == nil {
+					t.Error("expected 'to' field in request body")
+				}
+				messages := body["messages"].([]interface{})
+				if len(messages) != 1 {
+					t.Errorf("expected 1 message, got %d", len(messages))
+				}
+				return &http.Response{StatusCode: http.StatusOK, Body: http.NoBody}
+			}),
+			expectedError: false,
+		},
+		{
+			name:     "resolved",
+			provider: AlertProvider{DefaultConfig: Config{ChannelAccessToken: "token123", UserIDs: []string{"U123"}}},
+			alert:    alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			resolved: true,
+			mockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
+				body := make(map[string]interface{})
+				json.NewDecoder(r.Body).Decode(&body)
+				messages := body["messages"].([]interface{})
+				message := messages[0].(map[string]interface{})
+				text := message["text"].(string)
+				if !contains(text, "RESOLVED") {
+					t.Errorf("expected message to contain 'RESOLVED', got %s", text)
+				}
+				return &http.Response{StatusCode: http.StatusOK, Body: http.NoBody}
+			}),
+			expectedError: false,
+		},
+		{
+			name:     "error-response",
+			provider: AlertProvider{DefaultConfig: Config{ChannelAccessToken: "token123", UserIDs: []string{"U123"}}},
+			alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			resolved: false,
+			mockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
+				return &http.Response{StatusCode: http.StatusBadRequest, Body: http.NoBody}
+			}),
+			expectedError: true,
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(scenario.name, func(t *testing.T) {
+			client.InjectHTTPClient(&http.Client{Transport: scenario.mockRoundTripper})
+			err := scenario.provider.Send(
+				&endpoint.Endpoint{Name: "endpoint-name"},
+				&scenario.alert,
+				&endpoint.Result{
+					ConditionResults: []*endpoint.ConditionResult{
+						{Condition: "[CONNECTED] == true", Success: scenario.resolved},
+						{Condition: "[STATUS] == 200", Success: scenario.resolved},
+					},
+				},
+				scenario.resolved,
+			)
+			if scenario.expectedError && err == nil {
+				t.Error("expected error, got none")
+			}
+			if !scenario.expectedError && err != nil {
+				t.Error("expected no error, got", err.Error())
+			}
+		})
+	}
+}
+
+func TestAlertProvider_GetDefaultAlert(t *testing.T) {
+	if (&AlertProvider{DefaultAlert: &alert.Alert{}}).GetDefaultAlert() == nil {
+		t.Error("expected default alert to be not nil")
+	}
+	if (&AlertProvider{DefaultAlert: nil}).GetDefaultAlert() != nil {
+		t.Error("expected default alert to be nil")
+	}
+}
+
+func contains(s, substr string) bool {
+	return len(s) >= len(substr) && s[0:len(substr)] == substr || len(s) > len(substr) && contains(s[1:], substr)
+}

alerting/provider/matrix/matrix.go

@@ -3,39 +3,28 @@ package matrix
 import (
 	"bytes"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"io"
 	"math/rand"
 	"net/http"
 	"net/url"
-	"time"
 
 	"github.com/TwiN/gatus/v5/alerting/alert"
 	"github.com/TwiN/gatus/v5/client"
 	"github.com/TwiN/gatus/v5/config/endpoint"
+	"gopkg.in/yaml.v3"
 )
 
-// AlertProvider is the configuration necessary for sending an alert using Matrix
-type AlertProvider struct {
-	ProviderConfig `yaml:",inline"`
-
-	// DefaultAlert is the default alert configuration to use for endpoints with an alert of the appropriate type
-	DefaultAlert *alert.Alert `yaml:"default-alert,omitempty"`
-
-	// Overrides is a list of Override that may be prioritized over the default configuration
-	Overrides []Override `yaml:"overrides,omitempty"`
-}
-
-// Override is a case under which the default integration is overridden
-type Override struct {
-	Group string `yaml:"group"`
-
-	ProviderConfig `yaml:",inline"`
-}
-
 const defaultServerURL = "https://matrix-client.matrix.org"
 
-type ProviderConfig struct {
+var (
+	ErrAccessTokenNotSet      = errors.New("access-token not set")
+	ErrInternalRoomID         = errors.New("internal-room-id not set")
+	ErrDuplicateGroupOverride = errors.New("duplicate group override")
+)
+
+type Config struct {
 	// ServerURL is the custom homeserver to use (optional)
 	ServerURL string `yaml:"server-url"`
 
@@ -46,36 +35,78 @@ type ProviderConfig struct {
 	InternalRoomID string `yaml:"internal-room-id"`
 }
 
-// IsValid returns whether the provider's configuration is valid
-func (provider *AlertProvider) IsValid() bool {
+func (cfg *Config) Validate() error {
+	if len(cfg.ServerURL) == 0 {
+		cfg.ServerURL = defaultServerURL
+	}
+	if len(cfg.AccessToken) == 0 {
+		return ErrAccessTokenNotSet
+	}
+	if len(cfg.InternalRoomID) == 0 {
+		return ErrInternalRoomID
+	}
+	return nil
+}
+
+func (cfg *Config) Merge(override *Config) {
+	if len(override.ServerURL) > 0 {
+		cfg.ServerURL = override.ServerURL
+	}
+	if len(override.AccessToken) > 0 {
+		cfg.AccessToken = override.AccessToken
+	}
+	if len(override.InternalRoomID) > 0 {
+		cfg.InternalRoomID = override.InternalRoomID
+	}
+}
+
+// AlertProvider is the configuration necessary for sending an alert using Matrix
+type AlertProvider struct {
+	DefaultConfig Config `yaml:",inline"`
+
+	// DefaultAlert is the default alert configuration to use for endpoints with an alert of the appropriate type
+	DefaultAlert *alert.Alert `yaml:"default-alert,omitempty"`
+
+	// Overrides is a list of Override that may be prioritized over the default configuration
+	Overrides []Override `yaml:"overrides,omitempty"`
+}
+
+// Override is a case under which the default integration is overridden
+type Override struct {
+	Group  string `yaml:"group"`
+	Config `yaml:",inline"`
+}
+
+// Validate the provider's configuration
+func (provider *AlertProvider) Validate() error {
 	registeredGroups := make(map[string]bool)
 	if provider.Overrides != nil {
 		for _, override := range provider.Overrides {
 			if isAlreadyRegistered := registeredGroups[override.Group]; isAlreadyRegistered || override.Group == "" || len(override.AccessToken) == 0 || len(override.InternalRoomID) == 0 {
-				return false
+				return ErrDuplicateGroupOverride
 			}
 			registeredGroups[override.Group] = true
 		}
 	}
-	return len(provider.AccessToken) > 0 && len(provider.InternalRoomID) > 0
+	return provider.DefaultConfig.Validate()
 }
 
 // Send an alert using the provider
 func (provider *AlertProvider) Send(ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) error {
-	buffer := bytes.NewBuffer(provider.buildRequestBody(ep, alert, result, resolved))
-	config := provider.getConfigForGroup(ep.Group)
-	if config.ServerURL == "" {
-		config.ServerURL = defaultServerURL
+	cfg, err := provider.GetConfig(ep.Group, alert)
+	if err != nil {
+		return err
 	}
+	buffer := bytes.NewBuffer(provider.buildRequestBody(ep, alert, result, resolved))
 	// The Matrix endpoint requires a unique transaction ID for each event sent
 	txnId := randStringBytes(24)
 	request, err := http.NewRequest(
 		http.MethodPut,
 		fmt.Sprintf("%s/_matrix/client/v3/rooms/%s/send/m.room.message/%s?access_token=%s",
-			config.ServerURL,
-			url.PathEscape(config.InternalRoomID),
+			cfg.ServerURL,
+			url.PathEscape(cfg.InternalRoomID),
 			txnId,
-			url.QueryEscape(config.AccessToken),
+			url.QueryEscape(cfg.AccessToken),
 		),
 		buffer,
 	)
@@ -167,23 +198,10 @@ func buildHTMLMessageBody(ep *endpoint.Endpoint, alert *alert.Alert, result *end
 	return fmt.Sprintf("<h3>%s</h3>%s%s", message, description, formattedConditionResults)
 }
 
-// getConfigForGroup returns the appropriate configuration for a given group
-func (provider *AlertProvider) getConfigForGroup(group string) ProviderConfig {
-	if provider.Overrides != nil {
-		for _, override := range provider.Overrides {
-			if group == override.Group {
-				return override.ProviderConfig
-			}
-		}
-	}
-	return provider.ProviderConfig
-}
-
 func randStringBytes(n int) string {
 	// All the compatible characters to use in a transaction ID
 	const availableCharacterBytes = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
 	b := make([]byte, n)
-	rand.Seed(time.Now().UnixNano())
 	for i := range b {
 		b[i] = availableCharacterBytes[rand.Intn(len(availableCharacterBytes))]
 	}
@@ -194,3 +212,34 @@ func randStringBytes(n int) string {
 func (provider *AlertProvider) GetDefaultAlert() *alert.Alert {
 	return provider.DefaultAlert
 }
+
+// GetConfig returns the configuration for the provider with the overrides applied
+func (provider *AlertProvider) GetConfig(group string, alert *alert.Alert) (*Config, error) {
+	cfg := provider.DefaultConfig
+	// Handle group overrides
+	if provider.Overrides != nil {
+		for _, override := range provider.Overrides {
+			if group == override.Group {
+				cfg.Merge(&override.Config)
+				break
+			}
+		}
+	}
+	// Handle alert overrides
+	if len(alert.ProviderOverride) != 0 {
+		overrideConfig := Config{}
+		if err := yaml.Unmarshal(alert.ProviderOverrideAsBytes(), &overrideConfig); err != nil {
+			return nil, err
+		}
+		cfg.Merge(&overrideConfig)
+	}
+	// Validate the configuration
+	err := cfg.Validate()
+	return &cfg, err
+}
+
+// ValidateOverrides validates the alert's provider override and, if present, the group override
+func (provider *AlertProvider) ValidateOverrides(group string, alert *alert.Alert) error {
+	_, err := provider.GetConfig(group, alert)
+	return err
+}

alerting/provider/matrix/matrix_test.go

@@ -11,75 +11,75 @@ import (
 	"github.com/TwiN/gatus/v5/test"
 )
 
-func TestAlertProvider_IsValid(t *testing.T) {
+func TestAlertProvider_Validate(t *testing.T) {
 	invalidProvider := AlertProvider{
-		ProviderConfig: ProviderConfig{
+		DefaultConfig: Config{
 			AccessToken:    "",
 			InternalRoomID: "",
 		},
 	}
-	if invalidProvider.IsValid() {
+	if err := invalidProvider.Validate(); err == nil {
 		t.Error("provider shouldn't have been valid")
 	}
 	validProvider := AlertProvider{
-		ProviderConfig: ProviderConfig{
+		DefaultConfig: Config{
 			AccessToken:    "1",
 			InternalRoomID: "!a:example.com",
 		},
 	}
-	if !validProvider.IsValid() {
+	if err := validProvider.Validate(); err != nil {
 		t.Error("provider should've been valid")
 	}
 	validProviderWithHomeserver := AlertProvider{
-		ProviderConfig: ProviderConfig{
+		DefaultConfig: Config{
 			ServerURL:      "https://example.com",
 			AccessToken:    "1",
 			InternalRoomID: "!a:example.com",
 		},
 	}
-	if !validProviderWithHomeserver.IsValid() {
+	if err := validProviderWithHomeserver.Validate(); err != nil {
 		t.Error("provider with homeserver should've been valid")
 	}
 }
 
-func TestAlertProvider_IsValidWithOverride(t *testing.T) {
+func TestAlertProvider_ValidateWithOverride(t *testing.T) {
 	providerWithInvalidOverrideGroup := AlertProvider{
 		Overrides: []Override{
 			{
 				Group: "",
-				ProviderConfig: ProviderConfig{
+				Config: Config{
 					AccessToken:    "",
 					InternalRoomID: "",
 				},
 			},
 		},
 	}
-	if providerWithInvalidOverrideGroup.IsValid() {
+	if err := providerWithInvalidOverrideGroup.Validate(); err == nil {
 		t.Error("provider Group shouldn't have been valid")
 	}
 	providerWithInvalidOverrideTo := AlertProvider{
 		Overrides: []Override{
 			{
 				Group: "group",
-				ProviderConfig: ProviderConfig{
+				Config: Config{
 					AccessToken:    "",
 					InternalRoomID: "",
 				},
 			},
 		},
 	}
-	if providerWithInvalidOverrideTo.IsValid() {
+	if err := providerWithInvalidOverrideTo.Validate(); err == nil {
 		t.Error("provider integration key shouldn't have been valid")
 	}
 	providerWithValidOverride := AlertProvider{
-		ProviderConfig: ProviderConfig{
+		DefaultConfig: Config{
 			AccessToken:    "1",
 			InternalRoomID: "!a:example.com",
 		},
 		Overrides: []Override{
 			{
 				Group: "group",
-				ProviderConfig: ProviderConfig{
+				Config: Config{
 					ServerURL:      "https://example.com",
 					AccessToken:    "1",
 					InternalRoomID: "!a:example.com",
@@ -87,7 +87,7 @@ func TestAlertProvider_IsValidWithOverride(t *testing.T) {
 			},
 		},
 	}
-	if !providerWithValidOverride.IsValid() {
+	if err := providerWithValidOverride.Validate(); err != nil {
 		t.Error("provider should've been valid")
 	}
 }
@@ -105,18 +105,28 @@ func TestAlertProvider_Send(t *testing.T) {
 		ExpectedError    bool
 	}{
 		{
-			Name:     "triggered",
+			Name:     "triggered-with-bad-config",
 			Provider: AlertProvider{},
 			Alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved: false,
 			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
 				return &http.Response{StatusCode: http.StatusOK, Body: http.NoBody}
 			}),
+			ExpectedError: true,
+		},
+		{
+			Name:     "triggered",
+			Provider: AlertProvider{DefaultConfig: Config{AccessToken: "1", InternalRoomID: "!a:example.com"}},
+			Alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved: false,
+			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
+				return &http.Response{StatusCode: http.StatusOK, Body: http.NoBody}
+			}),
 			ExpectedError: false,
 		},
 		{
 			Name:     "triggered-error",
-			Provider: AlertProvider{},
+			Provider: AlertProvider{DefaultConfig: Config{AccessToken: "1", InternalRoomID: "!a:example.com"}},
 			Alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved: false,
 			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
@@ -126,7 +136,7 @@ func TestAlertProvider_Send(t *testing.T) {
 		},
 		{
 			Name:     "resolved",
-			Provider: AlertProvider{},
+			Provider: AlertProvider{DefaultConfig: Config{AccessToken: "1", InternalRoomID: "!a:example.com"}},
 			Alert:    alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved: true,
 			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
@@ -136,7 +146,7 @@ func TestAlertProvider_Send(t *testing.T) {
 		},
 		{
 			Name:     "resolved-error",
-			Provider: AlertProvider{},
+			Provider: AlertProvider{DefaultConfig: Config{AccessToken: "1", InternalRoomID: "!a:example.com"}},
 			Alert:    alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved: true,
 			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
@@ -227,17 +237,18 @@ func TestAlertProvider_GetDefaultAlert(t *testing.T) {
 	}
 }
 
-func TestAlertProvider_getConfigForGroup(t *testing.T) {
-	tests := []struct {
+func TestAlertProvider_GetConfig(t *testing.T) {
+	scenarios := []struct {
 		Name           string
 		Provider       AlertProvider
 		InputGroup     string
-		ExpectedOutput ProviderConfig
+		InputAlert     alert.Alert
+		ExpectedOutput Config
 	}{
 		{
 			Name: "provider-no-override-specify-no-group-should-default",
 			Provider: AlertProvider{
-				ProviderConfig: ProviderConfig{
+				DefaultConfig: Config{
 					ServerURL:      "https://example.com",
 					AccessToken:    "1",
 					InternalRoomID: "!a:example.com",
@@ -245,7 +256,8 @@ func TestAlertProvider_getConfigForGroup(t *testing.T) {
 				Overrides: nil,
 			},
 			InputGroup: "",
-			ExpectedOutput: ProviderConfig{
+			InputAlert: alert.Alert{},
+			ExpectedOutput: Config{
 				ServerURL:      "https://example.com",
 				AccessToken:    "1",
 				InternalRoomID: "!a:example.com",
@@ -254,7 +266,7 @@ func TestAlertProvider_getConfigForGroup(t *testing.T) {
 		{
 			Name: "provider-no-override-specify-group-should-default",
 			Provider: AlertProvider{
-				ProviderConfig: ProviderConfig{
+				DefaultConfig: Config{
 					ServerURL:      "https://example.com",
 					AccessToken:    "1",
 					InternalRoomID: "!a:example.com",
@@ -262,7 +274,8 @@ func TestAlertProvider_getConfigForGroup(t *testing.T) {
 				Overrides: nil,
 			},
 			InputGroup: "group",
-			ExpectedOutput: ProviderConfig{
+			InputAlert: alert.Alert{},
+			ExpectedOutput: Config{
 				ServerURL:      "https://example.com",
 				AccessToken:    "1",
 				InternalRoomID: "!a:example.com",
@@ -271,7 +284,7 @@ func TestAlertProvider_getConfigForGroup(t *testing.T) {
 		{
 			Name: "provider-with-override-specify-no-group-should-default",
 			Provider: AlertProvider{
-				ProviderConfig: ProviderConfig{
+				DefaultConfig: Config{
 					ServerURL:      "https://example.com",
 					AccessToken:    "1",
 					InternalRoomID: "!a:example.com",
@@ -279,16 +292,17 @@ func TestAlertProvider_getConfigForGroup(t *testing.T) {
 				Overrides: []Override{
 					{
 						Group: "group",
-						ProviderConfig: ProviderConfig{
-							ServerURL:      "https://example01.com",
+						Config: Config{
+							ServerURL:      "https://group-example.com",
 							AccessToken:    "12",
-							InternalRoomID: "!a:example01.com",
+							InternalRoomID: "!a:group-example.com",
 						},
 					},
 				},
 			},
 			InputGroup: "",
-			ExpectedOutput: ProviderConfig{
+			InputAlert: alert.Alert{},
+			ExpectedOutput: Config{
 				ServerURL:      "https://example.com",
 				AccessToken:    "1",
 				InternalRoomID: "!a:example.com",
@@ -297,7 +311,7 @@ func TestAlertProvider_getConfigForGroup(t *testing.T) {
 		{
 			Name: "provider-with-override-specify-group-should-override",
 			Provider: AlertProvider{
-				ProviderConfig: ProviderConfig{
+				DefaultConfig: Config{
 					ServerURL:      "https://example.com",
 					AccessToken:    "1",
 					InternalRoomID: "!a:example.com",
@@ -305,8 +319,35 @@ func TestAlertProvider_getConfigForGroup(t *testing.T) {
 				Overrides: []Override{
 					{
 						Group: "group",
-						ProviderConfig: ProviderConfig{
-							ServerURL:      "https://example01.com",
+						Config: Config{
+							ServerURL:      "https://group-example.com",
+							AccessToken:    "12",
+							InternalRoomID: "!a:group-example.com",
+						},
+					},
+				},
+			},
+			InputGroup: "group",
+			InputAlert: alert.Alert{},
+			ExpectedOutput: Config{
+				ServerURL:      "https://group-example.com",
+				AccessToken:    "12",
+				InternalRoomID: "!a:group-example.com",
+			},
+		},
+		{
+			Name: "provider-with-group-override-and-alert-override--alert-override-should-take-precedence",
+			Provider: AlertProvider{
+				DefaultConfig: Config{
+					ServerURL:      "https://example.com",
+					AccessToken:    "1",
+					InternalRoomID: "!a:example.com",
+				},
+				Overrides: []Override{
+					{
+						Group: "group",
+						Config: Config{
+							ServerURL:      "https://group-example.com",
 							AccessToken:    "12",
 							InternalRoomID: "!a:example01.com",
 						},
@@ -314,17 +355,32 @@ func TestAlertProvider_getConfigForGroup(t *testing.T) {
 				},
 			},
 			InputGroup: "group",
-			ExpectedOutput: ProviderConfig{
-				ServerURL:      "https://example01.com",
-				AccessToken:    "12",
-				InternalRoomID: "!a:example01.com",
+			InputAlert: alert.Alert{ProviderOverride: map[string]any{"server-url": "https://alert-example.com", "access-token": "123", "internal-room-id": "!a:alert-example.com"}},
+			ExpectedOutput: Config{
+				ServerURL:      "https://alert-example.com",
+				AccessToken:    "123",
+				InternalRoomID: "!a:alert-example.com",
 			},
 		},
 	}
-	for _, tt := range tests {
-		t.Run(tt.Name, func(t *testing.T) {
-			if got := tt.Provider.getConfigForGroup(tt.InputGroup); got != tt.ExpectedOutput {
-				t.Errorf("AlertProvider.getConfigForGroup() = %v, want %v", got, tt.ExpectedOutput)
+	for _, scenario := range scenarios {
+		t.Run(scenario.Name, func(t *testing.T) {
+			outputConfig, err := scenario.Provider.GetConfig(scenario.InputGroup, &scenario.InputAlert)
+			if err != nil {
+				t.Errorf("expected no error, got %v", err)
+			}
+			if outputConfig.ServerURL != scenario.ExpectedOutput.ServerURL {
+				t.Errorf("expected ServerURL to be %s, got %s", scenario.ExpectedOutput.ServerURL, outputConfig.ServerURL)
+			}
+			if outputConfig.AccessToken != scenario.ExpectedOutput.AccessToken {
+				t.Errorf("expected AccessToken to be %s, got %s", scenario.ExpectedOutput.AccessToken, outputConfig.AccessToken)
+			}
+			if outputConfig.InternalRoomID != scenario.ExpectedOutput.InternalRoomID {
+				t.Errorf("expected InternalRoomID to be %s, got %s", scenario.ExpectedOutput.InternalRoomID, outputConfig.InternalRoomID)
+			}
+			// Test ValidateOverrides as well, since it really just calls GetConfig
+			if err = scenario.Provider.ValidateOverrides(scenario.InputGroup, &scenario.InputAlert); err != nil {
+				t.Errorf("unexpected error: %s", err)
 			}
 		})
 	}

alerting/provider/mattermost/mattermost.go

@@ -3,6 +3,7 @@ package mattermost
 import (
 	"bytes"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"io"
 	"net/http"
@@ -10,14 +11,42 @@ import (
 	"github.com/TwiN/gatus/v5/alerting/alert"
 	"github.com/TwiN/gatus/v5/client"
 	"github.com/TwiN/gatus/v5/config/endpoint"
+	"gopkg.in/yaml.v3"
 )
 
+var (
+	ErrWebhookURLNotSet       = errors.New("webhook URL not set")
+	ErrDuplicateGroupOverride = errors.New("duplicate group override")
+)
+
+type Config struct {
+	WebhookURL   string         `yaml:"webhook-url"`
+	Channel      string         `yaml:"channel,omitempty"`
+	ClientConfig *client.Config `yaml:"client,omitempty"`
+}
+
+func (cfg *Config) Validate() error {
+	if len(cfg.WebhookURL) == 0 {
+		return ErrWebhookURLNotSet
+	}
+	return nil
+}
+
+func (cfg *Config) Merge(override *Config) {
+	if override.ClientConfig != nil {
+		cfg.ClientConfig = override.ClientConfig
+	}
+	if len(override.WebhookURL) > 0 {
+		cfg.WebhookURL = override.WebhookURL
+	}
+	if len(override.Channel) > 0 {
+		cfg.Channel = override.Channel
+	}
+}
+
 // AlertProvider is the configuration necessary for sending an alert using Mattermost
 type AlertProvider struct {
-	WebhookURL string `yaml:"webhook-url"`
-
-	// ClientConfig is the configuration of the client used to communicate with the provider's target
-	ClientConfig *client.Config `yaml:"client,omitempty"`
+	DefaultConfig Config `yaml:",inline"`
 
 	// DefaultAlert is the default alert configuration to use for endpoints with an alert of the appropriate type
 	DefaultAlert *alert.Alert `yaml:"default-alert,omitempty"`
@@ -28,36 +57,37 @@ type AlertProvider struct {
 
 // Override is a case under which the default integration is overridden
 type Override struct {
-	Group      string `yaml:"group"`
-	WebhookURL string `yaml:"webhook-url"`
+	Group  string `yaml:"group"`
+	Config `yaml:",inline"`
 }
 
-// IsValid returns whether the provider's configuration is valid
-func (provider *AlertProvider) IsValid() bool {
-	if provider.ClientConfig == nil {
-		provider.ClientConfig = client.GetDefaultConfig()
-	}
+// Validate the provider's configuration
+func (provider *AlertProvider) Validate() error {
 	if provider.Overrides != nil {
 		registeredGroups := make(map[string]bool)
 		for _, override := range provider.Overrides {
 			if isAlreadyRegistered := registeredGroups[override.Group]; isAlreadyRegistered || override.Group == "" || len(override.WebhookURL) == 0 {
-				return false
+				return ErrDuplicateGroupOverride
 			}
 			registeredGroups[override.Group] = true
 		}
 	}
-	return len(provider.WebhookURL) > 0
+	return provider.DefaultConfig.Validate()
 }
 
 // Send an alert using the provider
 func (provider *AlertProvider) Send(ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) error {
-	buffer := bytes.NewBuffer([]byte(provider.buildRequestBody(ep, alert, result, resolved)))
-	request, err := http.NewRequest(http.MethodPost, provider.getWebhookURLForGroup(ep.Group), buffer)
+	cfg, err := provider.GetConfig(ep.Group, alert)
+	if err != nil {
+		return err
+	}
+	buffer := bytes.NewBuffer([]byte(provider.buildRequestBody(cfg, ep, alert, result, resolved)))
+	request, err := http.NewRequest(http.MethodPost, cfg.WebhookURL, buffer)
 	if err != nil {
 		return err
 	}
 	request.Header.Set("Content-Type", "application/json")
-	response, err := client.GetHTTPClient(provider.ClientConfig).Do(request)
+	response, err := client.GetHTTPClient(cfg.ClientConfig).Do(request)
 	if err != nil {
 		return err
 	}
@@ -70,6 +100,7 @@ func (provider *AlertProvider) Send(ep *endpoint.Endpoint, alert *alert.Alert, r
 }
 
 type Body struct {
+	Channel     string       `json:"channel,omitempty"` // Optional channel override
 	Text        string       `json:"text"`
 	Username    string       `json:"username"`
 	IconURL     string       `json:"icon_url"`
@@ -92,7 +123,7 @@ type Field struct {
 }
 
 // buildRequestBody builds the request body for the provider
-func (provider *AlertProvider) buildRequestBody(ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) []byte {
+func (provider *AlertProvider) buildRequestBody(cfg *Config, ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) []byte {
 	var message, color string
 	if resolved {
 		message = fmt.Sprintf("An alert for *%s* has been resolved after passing successfully %d time(s) in a row", ep.DisplayName(), alert.SuccessThreshold)
@@ -118,6 +149,7 @@ func (provider *AlertProvider) buildRequestBody(ep *endpoint.Endpoint, alert *al
 		description = ":\n> " + alertDescription
 	}
 	body := Body{
+		Channel:  cfg.Channel,
 		Text:     "",
 		Username: "gatus",
 		IconURL:  "https://raw.githubusercontent.com/TwiN/gatus/master/.github/assets/logo.png",
@@ -142,19 +174,38 @@ func (provider *AlertProvider) buildRequestBody(ep *endpoint.Endpoint, alert *al
 	return bodyAsJSON
 }
 
-// getWebhookURLForGroup returns the appropriate Webhook URL integration to for a given group
-func (provider *AlertProvider) getWebhookURLForGroup(group string) string {
-	if provider.Overrides != nil {
-		for _, override := range provider.Overrides {
-			if group == override.Group {
-				return override.WebhookURL
-			}
-		}
-	}
-	return provider.WebhookURL
-}
-
 // GetDefaultAlert returns the provider's default alert configuration
 func (provider *AlertProvider) GetDefaultAlert() *alert.Alert {
 	return provider.DefaultAlert
 }
+
+// GetConfig returns the configuration for the provider with the overrides applied
+func (provider *AlertProvider) GetConfig(group string, alert *alert.Alert) (*Config, error) {
+	cfg := provider.DefaultConfig
+	// Handle group overrides
+	if provider.Overrides != nil {
+		for _, override := range provider.Overrides {
+			if group == override.Group {
+				cfg.Merge(&override.Config)
+				break
+			}
+		}
+	}
+	// Handle alert overrides
+	if len(alert.ProviderOverride) != 0 {
+		overrideConfig := Config{}
+		if err := yaml.Unmarshal(alert.ProviderOverrideAsBytes(), &overrideConfig); err != nil {
+			return nil, err
+		}
+		cfg.Merge(&overrideConfig)
+	}
+	// Validate the configuration
+	err := cfg.Validate()
+	return &cfg, err
+}
+
+// ValidateOverrides validates the alert's provider override and, if present, the group override
+func (provider *AlertProvider) ValidateOverrides(group string, alert *alert.Alert) error {
+	_, err := provider.GetConfig(group, alert)
+	return err
+}

alerting/provider/mattermost/mattermost_test.go

@@ -11,54 +11,50 @@ import (
 	"github.com/TwiN/gatus/v5/test"
 )
 
-func TestAlertProvider_IsValid(t *testing.T) {
-	invalidProvider := AlertProvider{WebhookURL: ""}
-	if invalidProvider.IsValid() {
+func TestAlertProvider_Validate(t *testing.T) {
+	invalidProvider := AlertProvider{DefaultConfig: Config{WebhookURL: ""}}
+	if err := invalidProvider.Validate(); err == nil {
 		t.Error("provider shouldn't have been valid")
 	}
-	validProvider := AlertProvider{WebhookURL: "http://example.com"}
-	if !validProvider.IsValid() {
+	validProvider := AlertProvider{DefaultConfig: Config{WebhookURL: "http://example.com"}}
+	if err := validProvider.Validate(); err != nil {
 		t.Error("provider should've been valid")
 	}
 }
 
-func TestAlertProvider_IsValidWithOverride(t *testing.T) {
+func TestAlertProvider_ValidateWithOverride(t *testing.T) {
 	providerWithInvalidOverrideGroup := AlertProvider{
 		Overrides: []Override{
 			{
-				WebhookURL: "http://example.com",
-				Group:      "",
+				Config: Config{WebhookURL: "http://example.com"},
+				Group:  "",
 			},
 		},
 	}
-
-	if providerWithInvalidOverrideGroup.IsValid() {
+	if err := providerWithInvalidOverrideGroup.Validate(); err == nil {
 		t.Error("provider Group shouldn't have been valid")
 	}
-
 	providerWithInvalidOverrideWebHookUrl := AlertProvider{
 		Overrides: []Override{
 			{
-
-				WebhookURL: "",
-				Group:      "group",
+				Config: Config{WebhookURL: ""},
+				Group:  "group",
 			},
 		},
 	}
-	if providerWithInvalidOverrideWebHookUrl.IsValid() {
+	if err := providerWithInvalidOverrideWebHookUrl.Validate(); err == nil {
 		t.Error("provider WebHookURL shouldn't have been valid")
 	}
-
 	providerWithValidOverride := AlertProvider{
-		WebhookURL: "http://example.com",
+		DefaultConfig: Config{WebhookURL: "http://example.com"},
 		Overrides: []Override{
 			{
-				WebhookURL: "http://example.com",
-				Group:      "group",
+				Config: Config{WebhookURL: "http://example.com"},
+				Group:  "group",
 			},
 		},
 	}
-	if !providerWithValidOverride.IsValid() {
+	if err := providerWithValidOverride.Validate(); err != nil {
 		t.Error("provider should've been valid")
 	}
 }
@@ -77,7 +73,7 @@ func TestAlertProvider_Send(t *testing.T) {
 	}{
 		{
 			Name:     "triggered",
-			Provider: AlertProvider{},
+			Provider: AlertProvider{DefaultConfig: Config{WebhookURL: "http://example.com"}},
 			Alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved: false,
 			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
@@ -87,7 +83,7 @@ func TestAlertProvider_Send(t *testing.T) {
 		},
 		{
 			Name:     "triggered-error",
-			Provider: AlertProvider{},
+			Provider: AlertProvider{DefaultConfig: Config{WebhookURL: "http://example.com"}},
 			Alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved: false,
 			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
@@ -97,7 +93,7 @@ func TestAlertProvider_Send(t *testing.T) {
 		},
 		{
 			Name:     "resolved",
-			Provider: AlertProvider{},
+			Provider: AlertProvider{DefaultConfig: Config{WebhookURL: "http://example.com"}},
 			Alert:    alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved: true,
 			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
@@ -107,7 +103,7 @@ func TestAlertProvider_Send(t *testing.T) {
 		},
 		{
 			Name:     "resolved-error",
-			Provider: AlertProvider{},
+			Provider: AlertProvider{DefaultConfig: Config{WebhookURL: "http://example.com"}},
 			Alert:    alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved: true,
 			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
@@ -168,6 +164,7 @@ func TestAlertProvider_buildRequestBody(t *testing.T) {
 	for _, scenario := range scenarios {
 		t.Run(scenario.Name, func(t *testing.T) {
 			body := scenario.Provider.buildRequestBody(
+				&scenario.Provider.DefaultConfig,
 				&endpoint.Endpoint{Name: "endpoint-name"},
 				&scenario.Alert,
 				&endpoint.Result{
@@ -198,64 +195,92 @@ func TestAlertProvider_GetDefaultAlert(t *testing.T) {
 	}
 }
 
-func TestAlertProvider_getWebhookURLForGroup(t *testing.T) {
-	tests := []struct {
+func TestAlertProvider_GetConfig(t *testing.T) {
+	scenarios := []struct {
 		Name           string
 		Provider       AlertProvider
 		InputGroup     string
-		ExpectedOutput string
+		InputAlert     alert.Alert
+		ExpectedOutput Config
 	}{
 		{
 			Name: "provider-no-override-specify-no-group-should-default",
 			Provider: AlertProvider{
-				WebhookURL: "http://example.com",
-				Overrides:  nil,
+				DefaultConfig: Config{WebhookURL: "http://example.com"},
+				Overrides:     nil,
 			},
 			InputGroup:     "",
-			ExpectedOutput: "http://example.com",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{WebhookURL: "http://example.com"},
 		},
 		{
 			Name: "provider-no-override-specify-group-should-default",
 			Provider: AlertProvider{
-				WebhookURL: "http://example.com",
-				Overrides:  nil,
+				DefaultConfig: Config{WebhookURL: "http://example.com"},
+				Overrides:     nil,
 			},
 			InputGroup:     "group",
-			ExpectedOutput: "http://example.com",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{WebhookURL: "http://example.com"},
 		},
 		{
 			Name: "provider-with-override-specify-no-group-should-default",
 			Provider: AlertProvider{
-				WebhookURL: "http://example.com",
+				DefaultConfig: Config{WebhookURL: "http://example.com"},
 				Overrides: []Override{
 					{
-						Group:      "group",
-						WebhookURL: "http://example01.com",
+						Group:  "group",
+						Config: Config{WebhookURL: "http://example01.com"},
 					},
 				},
 			},
 			InputGroup:     "",
-			ExpectedOutput: "http://example.com",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{WebhookURL: "http://example.com"},
 		},
 		{
 			Name: "provider-with-override-specify-group-should-override",
 			Provider: AlertProvider{
-				WebhookURL: "http://example.com",
+				DefaultConfig: Config{WebhookURL: "http://example.com"},
 				Overrides: []Override{
 					{
-						Group:      "group",
-						WebhookURL: "http://example01.com",
+						Group:  "group",
+						Config: Config{WebhookURL: "http://group-example.com"},
 					},
 				},
 			},
 			InputGroup:     "group",
-			ExpectedOutput: "http://example01.com",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{WebhookURL: "http://group-example.com"},
+		},
+		{
+			Name: "provider-with-group-override-and-alert-override--alert-override-should-take-precedence",
+			Provider: AlertProvider{
+				DefaultConfig: Config{WebhookURL: "http://example.com"},
+				Overrides: []Override{
+					{
+						Group:  "group",
+						Config: Config{WebhookURL: "http://group-example.com"},
+					},
+				},
+			},
+			InputGroup:     "group",
+			InputAlert:     alert.Alert{ProviderOverride: map[string]any{"webhook-url": "http://alert-example.com"}},
+			ExpectedOutput: Config{WebhookURL: "http://alert-example.com"},
 		},
 	}
-	for _, tt := range tests {
-		t.Run(tt.Name, func(t *testing.T) {
-			if got := tt.Provider.getWebhookURLForGroup(tt.InputGroup); got != tt.ExpectedOutput {
-				t.Errorf("AlertProvider.getToForGroup() = %v, want %v", got, tt.ExpectedOutput)
+	for _, scenario := range scenarios {
+		t.Run(scenario.Name, func(t *testing.T) {
+			got, err := scenario.Provider.GetConfig(scenario.InputGroup, &scenario.InputAlert)
+			if err != nil {
+				t.Fatalf("unexpected error: %s", err)
+			}
+			if got.WebhookURL != scenario.ExpectedOutput.WebhookURL {
+				t.Errorf("expected webhook URL to be %s, got %s", scenario.ExpectedOutput.WebhookURL, got.WebhookURL)
+			}
+			// Test ValidateOverrides as well, since it really just calls GetConfig
+			if err = scenario.Provider.ValidateOverrides(scenario.InputGroup, &scenario.InputAlert); err != nil {
+				t.Errorf("unexpected error: %s", err)
 			}
 		})
 	}

alerting/provider/messagebird/messagebird.go

@@ -3,6 +3,7 @@ package messagebird
 import (
 	"bytes"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"io"
 	"net/http"
@@ -10,37 +11,75 @@ import (
 	"github.com/TwiN/gatus/v5/alerting/alert"
 	"github.com/TwiN/gatus/v5/client"
 	"github.com/TwiN/gatus/v5/config/endpoint"
+	"gopkg.in/yaml.v3"
 )
 
-const (
-	restAPIURL = "https://rest.messagebird.com/messages"
+const restAPIURL = "https://rest.messagebird.com/messages"
+
+var (
+	ErrorAccessKeyNotSet  = errors.New("access-key not set")
+	ErrorOriginatorNotSet = errors.New("originator not set")
+	ErrorRecipientsNotSet = errors.New("recipients not set")
 )
 
-// AlertProvider is the configuration necessary for sending an alert using Messagebird
-type AlertProvider struct {
+type Config struct {
 	AccessKey  string `yaml:"access-key"`
 	Originator string `yaml:"originator"`
 	Recipients string `yaml:"recipients"`
+}
+
+func (cfg *Config) Validate() error {
+	if len(cfg.AccessKey) == 0 {
+		return ErrorAccessKeyNotSet
+	}
+	if len(cfg.Originator) == 0 {
+		return ErrorOriginatorNotSet
+	}
+	if len(cfg.Recipients) == 0 {
+		return ErrorRecipientsNotSet
+	}
+	return nil
+}
+
+func (cfg *Config) Merge(override *Config) {
+	if len(override.AccessKey) > 0 {
+		cfg.AccessKey = override.AccessKey
+	}
+	if len(override.Originator) > 0 {
+		cfg.Originator = override.Originator
+	}
+	if len(override.Recipients) > 0 {
+		cfg.Recipients = override.Recipients
+	}
+}
+
+// AlertProvider is the configuration necessary for sending an alert using Messagebird
+type AlertProvider struct {
+	DefaultConfig Config `yaml:",inline"`
 
 	// DefaultAlert is the default alert configuration to use for endpoints with an alert of the appropriate type
 	DefaultAlert *alert.Alert `yaml:"default-alert,omitempty"`
 }
 
-// IsValid returns whether the provider's configuration is valid
-func (provider *AlertProvider) IsValid() bool {
-	return len(provider.AccessKey) > 0 && len(provider.Originator) > 0 && len(provider.Recipients) > 0
+// Validate the provider's configuration
+func (provider *AlertProvider) Validate() error {
+	return provider.DefaultConfig.Validate()
 }
 
 // Send an alert using the provider
 // Reference doc for messagebird: https://developers.messagebird.com/api/sms-messaging/#send-outbound-sms
 func (provider *AlertProvider) Send(ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) error {
-	buffer := bytes.NewBuffer(provider.buildRequestBody(ep, alert, result, resolved))
+	cfg, err := provider.GetConfig(ep.Group, alert)
+	if err != nil {
+		return err
+	}
+	buffer := bytes.NewBuffer(provider.buildRequestBody(cfg, ep, alert, result, resolved))
 	request, err := http.NewRequest(http.MethodPost, restAPIURL, buffer)
 	if err != nil {
 		return err
 	}
 	request.Header.Set("Content-Type", "application/json")
-	request.Header.Set("Authorization", fmt.Sprintf("AccessKey %s", provider.AccessKey))
+	request.Header.Set("Authorization", fmt.Sprintf("AccessKey %s", cfg.AccessKey))
 	response, err := client.GetHTTPClient(nil).Do(request)
 	if err != nil {
 		return err
@@ -60,7 +99,7 @@ type Body struct {
 }
 
 // buildRequestBody builds the request body for the provider
-func (provider *AlertProvider) buildRequestBody(ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) []byte {
+func (provider *AlertProvider) buildRequestBody(cfg *Config, ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) []byte {
 	var message string
 	if resolved {
 		message = fmt.Sprintf("RESOLVED: %s - %s", ep.DisplayName(), alert.GetDescription())
@@ -68,8 +107,8 @@ func (provider *AlertProvider) buildRequestBody(ep *endpoint.Endpoint, alert *al
 		message = fmt.Sprintf("TRIGGERED: %s - %s", ep.DisplayName(), alert.GetDescription())
 	}
 	body, _ := json.Marshal(Body{
-		Originator: provider.Originator,
-		Recipients: provider.Recipients,
+		Originator: cfg.Originator,
+		Recipients: cfg.Recipients,
 		Body:       message,
 	})
 	return body
@@ -79,3 +118,25 @@ func (provider *AlertProvider) buildRequestBody(ep *endpoint.Endpoint, alert *al
 func (provider *AlertProvider) GetDefaultAlert() *alert.Alert {
 	return provider.DefaultAlert
 }
+
+// GetConfig returns the configuration for the provider with the overrides applied
+func (provider *AlertProvider) GetConfig(group string, alert *alert.Alert) (*Config, error) {
+	cfg := provider.DefaultConfig
+	// Handle alert overrides
+	if len(alert.ProviderOverride) != 0 {
+		overrideConfig := Config{}
+		if err := yaml.Unmarshal(alert.ProviderOverrideAsBytes(), &overrideConfig); err != nil {
+			return nil, err
+		}
+		cfg.Merge(&overrideConfig)
+	}
+	// Validate the configuration
+	err := cfg.Validate()
+	return &cfg, err
+}
+
+// ValidateOverrides validates the alert's provider override and, if present, the group override
+func (provider *AlertProvider) ValidateOverrides(group string, alert *alert.Alert) error {
+	_, err := provider.GetConfig(group, alert)
+	return err
+}

alerting/provider/messagebird/messagebird_test.go

@@ -13,15 +13,17 @@ import (
 
 func TestMessagebirdAlertProvider_IsValid(t *testing.T) {
 	invalidProvider := AlertProvider{}
-	if invalidProvider.IsValid() {
+	if err := invalidProvider.Validate(); err == nil {
 		t.Error("provider shouldn't have been valid")
 	}
 	validProvider := AlertProvider{
-		AccessKey:  "1",
-		Originator: "1",
-		Recipients: "1",
+		DefaultConfig: Config{
+			AccessKey:  "1",
+			Originator: "1",
+			Recipients: "1",
+		},
 	}
-	if !validProvider.IsValid() {
+	if err := validProvider.Validate(); err != nil {
 		t.Error("provider should've been valid")
 	}
 }
@@ -40,7 +42,7 @@ func TestAlertProvider_Send(t *testing.T) {
 	}{
 		{
 			Name:     "triggered",
-			Provider: AlertProvider{},
+			Provider: AlertProvider{DefaultConfig: Config{AccessKey: "1", Originator: "2", Recipients: "3"}},
 			Alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved: false,
 			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
@@ -50,7 +52,7 @@ func TestAlertProvider_Send(t *testing.T) {
 		},
 		{
 			Name:     "triggered-error",
-			Provider: AlertProvider{},
+			Provider: AlertProvider{DefaultConfig: Config{AccessKey: "1", Originator: "2", Recipients: "3"}},
 			Alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved: false,
 			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
@@ -60,7 +62,7 @@ func TestAlertProvider_Send(t *testing.T) {
 		},
 		{
 			Name:     "resolved",
-			Provider: AlertProvider{},
+			Provider: AlertProvider{DefaultConfig: Config{AccessKey: "1", Originator: "2", Recipients: "3"}},
 			Alert:    alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved: true,
 			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
@@ -70,7 +72,7 @@ func TestAlertProvider_Send(t *testing.T) {
 		},
 		{
 			Name:     "resolved-error",
-			Provider: AlertProvider{},
+			Provider: AlertProvider{DefaultConfig: Config{AccessKey: "1", Originator: "2", Recipients: "3"}},
 			Alert:    alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved: true,
 			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
@@ -115,14 +117,14 @@ func TestAlertProvider_buildRequestBody(t *testing.T) {
 	}{
 		{
 			Name:         "triggered",
-			Provider:     AlertProvider{AccessKey: "1", Originator: "2", Recipients: "3"},
+			Provider:     AlertProvider{DefaultConfig: Config{AccessKey: "1", Originator: "2", Recipients: "3"}},
 			Alert:        alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved:     false,
 			ExpectedBody: "{\"originator\":\"2\",\"recipients\":\"3\",\"body\":\"TRIGGERED: endpoint-name - description-1\"}",
 		},
 		{
 			Name:         "resolved",
-			Provider:     AlertProvider{AccessKey: "4", Originator: "5", Recipients: "6"},
+			Provider:     AlertProvider{DefaultConfig: Config{AccessKey: "4", Originator: "5", Recipients: "6"}},
 			Alert:        alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved:     true,
 			ExpectedBody: "{\"originator\":\"5\",\"recipients\":\"6\",\"body\":\"RESOLVED: endpoint-name - description-2\"}",
@@ -131,6 +133,7 @@ func TestAlertProvider_buildRequestBody(t *testing.T) {
 	for _, scenario := range scenarios {
 		t.Run(scenario.Name, func(t *testing.T) {
 			body := scenario.Provider.buildRequestBody(
+				&scenario.Provider.DefaultConfig,
 				&endpoint.Endpoint{Name: "endpoint-name"},
 				&scenario.Alert,
 				&endpoint.Result{
@@ -145,7 +148,7 @@ func TestAlertProvider_buildRequestBody(t *testing.T) {
 				t.Errorf("expected:\n%s\ngot:\n%s", scenario.ExpectedBody, body)
 			}
 			out := make(map[string]interface{})
-			if err := json.Unmarshal([]byte(body), &out); err != nil {
+			if err := json.Unmarshal(body, &out); err != nil {
 				t.Error("expected body to be valid JSON, got error:", err.Error())
 			}
 		})
@@ -160,3 +163,50 @@ func TestAlertProvider_GetDefaultAlert(t *testing.T) {
 		t.Error("expected default alert to be nil")
 	}
 }
+
+func TestAlertProvider_GetConfig(t *testing.T) {
+	scenarios := []struct {
+		Name           string
+		Provider       AlertProvider
+		InputAlert     alert.Alert
+		ExpectedOutput Config
+	}{
+		{
+			Name: "provider-no-override-should-default",
+			Provider: AlertProvider{
+				DefaultConfig: Config{AccessKey: "1", Originator: "2", Recipients: "3"},
+			},
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{AccessKey: "1", Originator: "2", Recipients: "3"},
+		},
+		{
+			Name: "provider-with-alert-override",
+			Provider: AlertProvider{
+				DefaultConfig: Config{AccessKey: "1", Originator: "2", Recipients: "3"},
+			},
+			InputAlert:     alert.Alert{ProviderOverride: map[string]any{"access-key": "4", "originator": "5", "recipients": "6"}},
+			ExpectedOutput: Config{AccessKey: "4", Originator: "5", Recipients: "6"},
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(scenario.Name, func(t *testing.T) {
+			got, err := scenario.Provider.GetConfig("", &scenario.InputAlert)
+			if err != nil {
+				t.Error("expected no error, got:", err.Error())
+			}
+			if got.AccessKey != scenario.ExpectedOutput.AccessKey {
+				t.Errorf("expected access key to be %s, got %s", scenario.ExpectedOutput.AccessKey, got.AccessKey)
+			}
+			if got.Originator != scenario.ExpectedOutput.Originator {
+				t.Errorf("expected originator to be %s, got %s", scenario.ExpectedOutput.Originator, got.Originator)
+			}
+			if got.Recipients != scenario.ExpectedOutput.Recipients {
+				t.Errorf("expected recipients to be %s, got %s", scenario.ExpectedOutput.Recipients, got.Recipients)
+			}
+			// Test ValidateOverrides as well, since it really just calls GetConfig
+			if err = scenario.Provider.ValidateOverrides("", &scenario.InputAlert); err != nil {
+				t.Errorf("unexpected error: %s", err)
+			}
+		})
+	}
+}

alerting/provider/n8n/n8n.go

@@ -0,0 +1,179 @@
+package n8n
+
+import (
+	"bytes"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"net/http"
+
+	"github.com/TwiN/gatus/v5/alerting/alert"
+	"github.com/TwiN/gatus/v5/client"
+	"github.com/TwiN/gatus/v5/config/endpoint"
+	"gopkg.in/yaml.v3"
+)
+
+var (
+	ErrWebhookURLNotSet       = errors.New("webhook-url not set")
+	ErrDuplicateGroupOverride = errors.New("duplicate group override")
+)
+
+type Config struct {
+	WebhookURL string `yaml:"webhook-url"`
+	Title      string `yaml:"title,omitempty"` // Title of the message that will be sent
+}
+
+func (cfg *Config) Validate() error {
+	if len(cfg.WebhookURL) == 0 {
+		return ErrWebhookURLNotSet
+	}
+	return nil
+}
+
+func (cfg *Config) Merge(override *Config) {
+	if len(override.WebhookURL) > 0 {
+		cfg.WebhookURL = override.WebhookURL
+	}
+	if len(override.Title) > 0 {
+		cfg.Title = override.Title
+	}
+}
+
+// AlertProvider is the configuration necessary for sending an alert using n8n
+type AlertProvider struct {
+	DefaultConfig Config `yaml:",inline"`
+	// DefaultAlert is the default alert configuration to use for endpoints with an alert of the appropriate type
+	DefaultAlert *alert.Alert `yaml:"default-alert,omitempty"`
+	// Overrides is a list of Override that may be prioritized over the default configuration
+	Overrides []Override `yaml:"overrides,omitempty"`
+}
+
+// Override is a case under which the default integration is overridden
+type Override struct {
+	Group  string `yaml:"group"`
+	Config `yaml:",inline"`
+}
+
+// Validate the provider's configuration
+func (provider *AlertProvider) Validate() error {
+	registeredGroups := make(map[string]bool)
+	if provider.Overrides != nil {
+		for _, override := range provider.Overrides {
+			if isAlreadyRegistered := registeredGroups[override.Group]; isAlreadyRegistered || override.Group == "" {
+				return ErrDuplicateGroupOverride
+			}
+			registeredGroups[override.Group] = true
+		}
+	}
+	return provider.DefaultConfig.Validate()
+}
+
+// Send an alert using the provider
+func (provider *AlertProvider) Send(ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) error {
+	cfg, err := provider.GetConfig(ep.Group, alert)
+	if err != nil {
+		return err
+	}
+	buffer := bytes.NewBuffer(provider.buildRequestBody(cfg, ep, alert, result, resolved))
+	request, err := http.NewRequest(http.MethodPost, cfg.WebhookURL, buffer)
+	if err != nil {
+		return err
+	}
+	request.Header.Set("Content-Type", "application/json")
+	response, err := client.GetHTTPClient(nil).Do(request)
+	if err != nil {
+		return err
+	}
+	defer response.Body.Close()
+	if response.StatusCode > 399 {
+		body, _ := io.ReadAll(response.Body)
+		return fmt.Errorf("call to provider alert returned status code %d: %s", response.StatusCode, string(body))
+	}
+	return err
+}
+
+type Body struct {
+	Title            string            `json:"title"`
+	EndpointName     string            `json:"endpoint_name"`
+	EndpointGroup    string            `json:"endpoint_group,omitempty"`
+	EndpointURL      string            `json:"endpoint_url"`
+	AlertDescription string            `json:"alert_description,omitempty"`
+	Resolved         bool              `json:"resolved"`
+	Message          string            `json:"message"`
+	ConditionResults []ConditionResult `json:"condition_results,omitempty"`
+}
+
+type ConditionResult struct {
+	Condition string `json:"condition"`
+	Success   bool   `json:"success"`
+}
+
+// buildRequestBody builds the request body for the provider
+func (provider *AlertProvider) buildRequestBody(cfg *Config, ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) []byte {
+	var message string
+	if resolved {
+		message = fmt.Sprintf("An alert for %s has been resolved after passing successfully %d time(s) in a row", ep.DisplayName(), alert.SuccessThreshold)
+	} else {
+		message = fmt.Sprintf("An alert for %s has been triggered due to having failed %d time(s) in a row", ep.DisplayName(), alert.FailureThreshold)
+	}
+	title := "Gatus"
+	if cfg.Title != "" {
+		title = cfg.Title
+	}
+	var conditionResults []ConditionResult
+	for _, conditionResult := range result.ConditionResults {
+		conditionResults = append(conditionResults, ConditionResult{
+			Condition: conditionResult.Condition,
+			Success:   conditionResult.Success,
+		})
+	}
+	body := Body{
+		Title:            title,
+		EndpointName:     ep.Name,
+		EndpointGroup:    ep.Group,
+		EndpointURL:      ep.URL,
+		AlertDescription: alert.GetDescription(),
+		Resolved:         resolved,
+		Message:          message,
+		ConditionResults: conditionResults,
+	}
+	bodyAsJSON, _ := json.Marshal(body)
+	return bodyAsJSON
+}
+
+// GetDefaultAlert returns the provider's default alert configuration
+func (provider *AlertProvider) GetDefaultAlert() *alert.Alert {
+	return provider.DefaultAlert
+}
+
+// GetConfig returns the configuration for the provider with the overrides applied
+func (provider *AlertProvider) GetConfig(group string, alert *alert.Alert) (*Config, error) {
+	cfg := provider.DefaultConfig
+	// Handle group overrides
+	if provider.Overrides != nil {
+		for _, override := range provider.Overrides {
+			if group == override.Group {
+				cfg.Merge(&override.Config)
+				break
+			}
+		}
+	}
+	// Handle alert overrides
+	if len(alert.ProviderOverride) != 0 {
+		overrideConfig := Config{}
+		if err := yaml.Unmarshal(alert.ProviderOverrideAsBytes(), &overrideConfig); err != nil {
+			return nil, err
+		}
+		cfg.Merge(&overrideConfig)
+	}
+	// Validate the configuration
+	err := cfg.Validate()
+	return &cfg, err
+}
+
+// ValidateOverrides validates the alert's provider override and, if present, the group override
+func (provider *AlertProvider) ValidateOverrides(group string, alert *alert.Alert) error {
+	_, err := provider.GetConfig(group, alert)
+	return err
+}

alerting/provider/n8n/n8n_test.go

@@ -0,0 +1,364 @@
+package n8n
+
+import (
+	"encoding/json"
+	"net/http"
+	"testing"
+
+	"github.com/TwiN/gatus/v5/alerting/alert"
+	"github.com/TwiN/gatus/v5/client"
+	"github.com/TwiN/gatus/v5/config/endpoint"
+	"github.com/TwiN/gatus/v5/test"
+)
+
+func TestAlertProvider_Validate(t *testing.T) {
+	invalidProvider := AlertProvider{DefaultConfig: Config{WebhookURL: ""}}
+	if err := invalidProvider.Validate(); err == nil {
+		t.Error("provider shouldn't have been valid")
+	}
+	validProvider := AlertProvider{DefaultConfig: Config{WebhookURL: "https://example.com"}}
+	if err := validProvider.Validate(); err != nil {
+		t.Error("provider should've been valid")
+	}
+}
+
+func TestAlertProvider_ValidateWithOverride(t *testing.T) {
+	providerWithInvalidOverrideGroup := AlertProvider{
+		Overrides: []Override{
+			{
+				Config: Config{WebhookURL: "http://example.com"},
+				Group:  "",
+			},
+		},
+	}
+	if err := providerWithInvalidOverrideGroup.Validate(); err == nil {
+		t.Error("provider Group shouldn't have been valid")
+	}
+	providerWithInvalidOverrideTo := AlertProvider{
+		Overrides: []Override{
+			{
+				Config: Config{WebhookURL: ""},
+				Group:  "group",
+			},
+		},
+	}
+	if err := providerWithInvalidOverrideTo.Validate(); err == nil {
+		t.Error("provider webhook URL shouldn't have been valid")
+	}
+	providerWithValidOverride := AlertProvider{
+		DefaultConfig: Config{WebhookURL: "http://example.com"},
+		Overrides: []Override{
+			{
+				Config: Config{WebhookURL: "http://example.com"},
+				Group:  "group",
+			},
+		},
+	}
+	if err := providerWithValidOverride.Validate(); err != nil {
+		t.Error("provider should've been valid")
+	}
+}
+
+func TestAlertProvider_Send(t *testing.T) {
+	defer client.InjectHTTPClient(nil)
+	firstDescription := "description-1"
+	secondDescription := "description-2"
+	scenarios := []struct {
+		Name             string
+		Provider         AlertProvider
+		Alert            alert.Alert
+		Resolved         bool
+		MockRoundTripper test.MockRoundTripper
+		ExpectedError    bool
+	}{
+		{
+			Name:     "triggered",
+			Provider: AlertProvider{DefaultConfig: Config{WebhookURL: "http://example.com"}},
+			Alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved: false,
+			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
+				return &http.Response{StatusCode: http.StatusOK, Body: http.NoBody}
+			}),
+			ExpectedError: false,
+		},
+		{
+			Name:     "triggered-error",
+			Provider: AlertProvider{DefaultConfig: Config{WebhookURL: "http://example.com"}},
+			Alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved: false,
+			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
+				return &http.Response{StatusCode: http.StatusInternalServerError, Body: http.NoBody}
+			}),
+			ExpectedError: true,
+		},
+		{
+			Name:     "resolved",
+			Provider: AlertProvider{DefaultConfig: Config{WebhookURL: "http://example.com"}},
+			Alert:    alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved: true,
+			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
+				return &http.Response{StatusCode: http.StatusOK, Body: http.NoBody}
+			}),
+			ExpectedError: false,
+		},
+		{
+			Name:     "resolved-error",
+			Provider: AlertProvider{DefaultConfig: Config{WebhookURL: "http://example.com"}},
+			Alert:    alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved: true,
+			MockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
+				return &http.Response{StatusCode: http.StatusInternalServerError, Body: http.NoBody}
+			}),
+			ExpectedError: true,
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(scenario.Name, func(t *testing.T) {
+			client.InjectHTTPClient(&http.Client{Transport: scenario.MockRoundTripper})
+			err := scenario.Provider.Send(
+				&endpoint.Endpoint{Name: "endpoint-name"},
+				&scenario.Alert,
+				&endpoint.Result{
+					ConditionResults: []*endpoint.ConditionResult{
+						{Condition: "[CONNECTED] == true", Success: scenario.Resolved},
+						{Condition: "[STATUS] == 200", Success: scenario.Resolved},
+					},
+				},
+				scenario.Resolved,
+			)
+			if scenario.ExpectedError && err == nil {
+				t.Error("expected error, got none")
+			}
+			if !scenario.ExpectedError && err != nil {
+				t.Error("expected no error, got", err.Error())
+			}
+		})
+	}
+}
+
+func TestAlertProvider_buildRequestBody(t *testing.T) {
+	firstDescription := "description-1"
+	secondDescription := "description-2"
+	scenarios := []struct {
+		Name         string
+		Provider     AlertProvider
+		Endpoint     endpoint.Endpoint
+		Alert        alert.Alert
+		Resolved     bool
+		ExpectedBody Body
+	}{
+		{
+			Name:     "triggered",
+			Provider: AlertProvider{DefaultConfig: Config{WebhookURL: "http://example.com"}},
+			Endpoint: endpoint.Endpoint{Name: "name", URL: "https://example.org"},
+			Alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved: false,
+			ExpectedBody: Body{
+				Title:            "Gatus",
+				EndpointName:     "name",
+				EndpointURL:      "https://example.org",
+				AlertDescription: "description-1",
+				Resolved:         false,
+				Message:          "An alert for name has been triggered due to having failed 3 time(s) in a row",
+				ConditionResults: []ConditionResult{
+					{Condition: "[CONNECTED] == true", Success: false},
+					{Condition: "[STATUS] == 200", Success: false},
+				},
+			},
+		},
+		{
+			Name:     "triggered-with-group",
+			Provider: AlertProvider{DefaultConfig: Config{WebhookURL: "http://example.com"}},
+			Endpoint: endpoint.Endpoint{Name: "name", Group: "group", URL: "https://example.org"},
+			Alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved: false,
+			ExpectedBody: Body{
+				Title:            "Gatus",
+				EndpointName:     "name",
+				EndpointGroup:    "group",
+				EndpointURL:      "https://example.org",
+				AlertDescription: "description-1",
+				Resolved:         false,
+				Message:          "An alert for group/name has been triggered due to having failed 3 time(s) in a row",
+				ConditionResults: []ConditionResult{
+					{Condition: "[CONNECTED] == true", Success: false},
+					{Condition: "[STATUS] == 200", Success: false},
+				},
+			},
+		},
+		{
+			Name:     "resolved",
+			Provider: AlertProvider{DefaultConfig: Config{WebhookURL: "http://example.com"}},
+			Endpoint: endpoint.Endpoint{Name: "name", URL: "https://example.org"},
+			Alert:    alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved: true,
+			ExpectedBody: Body{
+				Title:            "Gatus",
+				EndpointName:     "name",
+				EndpointURL:      "https://example.org",
+				AlertDescription: "description-2",
+				Resolved:         true,
+				Message:          "An alert for name has been resolved after passing successfully 5 time(s) in a row",
+				ConditionResults: []ConditionResult{
+					{Condition: "[CONNECTED] == true", Success: true},
+					{Condition: "[STATUS] == 200", Success: true},
+				},
+			},
+		},
+		{
+			Name:     "resolved-with-custom-title",
+			Provider: AlertProvider{DefaultConfig: Config{WebhookURL: "http://example.com", Title: "Custom Title"}},
+			Endpoint: endpoint.Endpoint{Name: "name", URL: "https://example.org"},
+			Alert:    alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved: true,
+			ExpectedBody: Body{
+				Title:            "Custom Title",
+				EndpointName:     "name",
+				EndpointURL:      "https://example.org",
+				AlertDescription: "description-2",
+				Resolved:         true,
+				Message:          "An alert for name has been resolved after passing successfully 5 time(s) in a row",
+				ConditionResults: []ConditionResult{
+					{Condition: "[CONNECTED] == true", Success: true},
+					{Condition: "[STATUS] == 200", Success: true},
+				},
+			},
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(scenario.Name, func(t *testing.T) {
+			cfg, err := scenario.Provider.GetConfig(scenario.Endpoint.Group, &scenario.Alert)
+			if err != nil {
+				t.Fatal("couldn't get config:", err.Error())
+			}
+			body := scenario.Provider.buildRequestBody(
+				cfg,
+				&scenario.Endpoint,
+				&scenario.Alert,
+				&endpoint.Result{
+					ConditionResults: []*endpoint.ConditionResult{
+						{Condition: "[CONNECTED] == true", Success: scenario.Resolved},
+						{Condition: "[STATUS] == 200", Success: scenario.Resolved},
+					},
+				},
+				scenario.Resolved,
+			)
+			var actualBody Body
+			if err := json.Unmarshal(body, &actualBody); err != nil {
+				t.Error("expected body to be valid JSON, got error:", err.Error())
+			}
+			if actualBody.Title != scenario.ExpectedBody.Title {
+				t.Errorf("expected title to be %s, got %s", scenario.ExpectedBody.Title, actualBody.Title)
+			}
+			if actualBody.EndpointName != scenario.ExpectedBody.EndpointName {
+				t.Errorf("expected endpoint name to be %s, got %s", scenario.ExpectedBody.EndpointName, actualBody.EndpointName)
+			}
+			if actualBody.Resolved != scenario.ExpectedBody.Resolved {
+				t.Errorf("expected resolved to be %v, got %v", scenario.ExpectedBody.Resolved, actualBody.Resolved)
+			}
+			if actualBody.Message != scenario.ExpectedBody.Message {
+				t.Errorf("expected message to be %s, got %s", scenario.ExpectedBody.Message, actualBody.Message)
+			}
+		})
+	}
+}
+
+func TestAlertProvider_GetDefaultAlert(t *testing.T) {
+	if (&AlertProvider{DefaultAlert: &alert.Alert{}}).GetDefaultAlert() == nil {
+		t.Error("expected default alert to be not nil")
+	}
+	if (&AlertProvider{DefaultAlert: nil}).GetDefaultAlert() != nil {
+		t.Error("expected default alert to be nil")
+	}
+}
+
+func TestAlertProvider_GetConfig(t *testing.T) {
+	scenarios := []struct {
+		Name           string
+		Provider       AlertProvider
+		InputGroup     string
+		InputAlert     alert.Alert
+		ExpectedOutput Config
+	}{
+		{
+			Name: "provider-no-override-specify-no-group-should-default",
+			Provider: AlertProvider{
+				DefaultConfig: Config{WebhookURL: "http://example.com"},
+				Overrides:     nil,
+			},
+			InputGroup:     "",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{WebhookURL: "http://example.com"},
+		},
+		{
+			Name: "provider-no-override-specify-group-should-default",
+			Provider: AlertProvider{
+				DefaultConfig: Config{WebhookURL: "http://example.com"},
+				Overrides:     nil,
+			},
+			InputGroup:     "group",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{WebhookURL: "http://example.com"},
+		},
+		{
+			Name: "provider-with-override-specify-no-group-should-default",
+			Provider: AlertProvider{
+				DefaultConfig: Config{WebhookURL: "http://example.com"},
+				Overrides: []Override{
+					{
+						Group:  "group",
+						Config: Config{WebhookURL: "http://example01.com"},
+					},
+				},
+			},
+			InputGroup:     "",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{WebhookURL: "http://example.com"},
+		},
+		{
+			Name: "provider-with-override-specify-group-should-override",
+			Provider: AlertProvider{
+				DefaultConfig: Config{WebhookURL: "http://example.com"},
+				Overrides: []Override{
+					{
+						Group:  "group",
+						Config: Config{WebhookURL: "http://group-example.com"},
+					},
+				},
+			},
+			InputGroup:     "group",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{WebhookURL: "http://group-example.com"},
+		},
+		{
+			Name: "provider-with-group-override-and-alert-override--alert-override-should-take-precedence",
+			Provider: AlertProvider{
+				DefaultConfig: Config{WebhookURL: "http://example.com"},
+				Overrides: []Override{
+					{
+						Group:  "group",
+						Config: Config{WebhookURL: "http://group-example.com"},
+					},
+				},
+			},
+			InputGroup:     "group",
+			InputAlert:     alert.Alert{ProviderOverride: map[string]any{"webhook-url": "http://alert-example.com"}},
+			ExpectedOutput: Config{WebhookURL: "http://alert-example.com"},
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(scenario.Name, func(t *testing.T) {
+			got, err := scenario.Provider.GetConfig(scenario.InputGroup, &scenario.InputAlert)
+			if err != nil {
+				t.Fatalf("unexpected error: %s", err)
+			}
+			if got.WebhookURL != scenario.ExpectedOutput.WebhookURL {
+				t.Errorf("expected webhook URL to be %s, got %s", scenario.ExpectedOutput.WebhookURL, got.WebhookURL)
+			}
+			// Test ValidateOverrides as well, since it really just calls GetConfig
+			if err = scenario.Provider.ValidateOverrides(scenario.InputGroup, &scenario.InputAlert); err != nil {
+				t.Errorf("unexpected error: %s", err)
+			}
+		})
+	}
+}

alerting/provider/newrelic/newrelic.go

@@ -0,0 +1,215 @@
+package newrelic
+
+import (
+	"bytes"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"net/http"
+	"time"
+
+	"github.com/TwiN/gatus/v5/alerting/alert"
+	"github.com/TwiN/gatus/v5/client"
+	"github.com/TwiN/gatus/v5/config/endpoint"
+	"gopkg.in/yaml.v3"
+)
+
+var (
+	ErrInsertKeyNotSet        = errors.New("insert-key not set")
+	ErrAccountIDNotSet        = errors.New("account-id not set")
+	ErrDuplicateGroupOverride = errors.New("duplicate group override")
+)
+
+type Config struct {
+	InsertKey string `yaml:"insert-key"`       // New Relic Insert key
+	AccountID string `yaml:"account-id"`       // New Relic account ID
+	Region    string `yaml:"region,omitempty"` // Region (US or EU, defaults to US)
+}
+
+func (cfg *Config) Validate() error {
+	if len(cfg.InsertKey) == 0 {
+		return ErrInsertKeyNotSet
+	}
+	if len(cfg.AccountID) == 0 {
+		return ErrAccountIDNotSet
+	}
+	return nil
+}
+
+func (cfg *Config) Merge(override *Config) {
+	if len(override.InsertKey) > 0 {
+		cfg.InsertKey = override.InsertKey
+	}
+	if len(override.AccountID) > 0 {
+		cfg.AccountID = override.AccountID
+	}
+	if len(override.Region) > 0 {
+		cfg.Region = override.Region
+	}
+}
+
+// AlertProvider is the configuration necessary for sending an alert using New Relic
+type AlertProvider struct {
+	DefaultConfig Config `yaml:",inline"`
+
+	// DefaultAlert is the default alert configuration to use for endpoints with an alert of the appropriate type
+	DefaultAlert *alert.Alert `yaml:"default-alert,omitempty"`
+
+	// Overrides is a list of Override that may be prioritized over the default configuration
+	Overrides []Override `yaml:"overrides,omitempty"`
+}
+
+// Override is a case under which the default integration is overridden
+type Override struct {
+	Group  string `yaml:"group"`
+	Config `yaml:",inline"`
+}
+
+// Validate the provider's configuration
+func (provider *AlertProvider) Validate() error {
+	registeredGroups := make(map[string]bool)
+	if provider.Overrides != nil {
+		for _, override := range provider.Overrides {
+			if isAlreadyRegistered := registeredGroups[override.Group]; isAlreadyRegistered || override.Group == "" {
+				return ErrDuplicateGroupOverride
+			}
+			registeredGroups[override.Group] = true
+		}
+	}
+	return provider.DefaultConfig.Validate()
+}
+
+// Send an alert using the provider
+func (provider *AlertProvider) Send(ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) error {
+	cfg, err := provider.GetConfig(ep.Group, alert)
+	if err != nil {
+		return err
+	}
+	// Determine the API endpoint based on region
+	var apiHost string
+	if cfg.Region == "EU" {
+		apiHost = "insights-collector.eu01.nr-data.net"
+	} else {
+		apiHost = "insights-collector.newrelic.com"
+	}
+	body, err := provider.buildRequestBody(cfg, ep, alert, result, resolved)
+	if err != nil {
+		return err
+	}
+	buffer := bytes.NewBuffer(body)
+	url := fmt.Sprintf("https://%s/v1/accounts/%s/events", apiHost, cfg.AccountID)
+	request, err := http.NewRequest(http.MethodPost, url, buffer)
+	if err != nil {
+		return err
+	}
+	request.Header.Set("Content-Type", "application/json")
+	request.Header.Set("X-Insert-Key", cfg.InsertKey)
+	response, err := client.GetHTTPClient(nil).Do(request)
+	if err != nil {
+		return err
+	}
+	defer response.Body.Close()
+	if response.StatusCode >= 400 {
+		body, _ := io.ReadAll(response.Body)
+		return fmt.Errorf("call to newrelic alert returned status code %d: %s", response.StatusCode, string(body))
+	}
+	return nil
+}
+
+type Event struct {
+	EventType   string  `json:"eventType"`
+	Timestamp   int64   `json:"timestamp"`
+	Service     string  `json:"service"`
+	Endpoint    string  `json:"endpoint"`
+	Group       string  `json:"group,omitempty"`
+	AlertStatus string  `json:"alertStatus"`
+	Message     string  `json:"message"`
+	Description string  `json:"description,omitempty"`
+	Severity    string  `json:"severity"`
+	Source      string  `json:"source"`
+	SuccessRate float64 `json:"successRate,omitempty"`
+}
+
+// buildRequestBody builds the request body for the provider
+func (provider *AlertProvider) buildRequestBody(cfg *Config, ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) ([]byte, error) {
+	var alertStatus, severity, message string
+	var successRate float64
+	if resolved {
+		alertStatus = "resolved"
+		severity = "INFO"
+		message = fmt.Sprintf("Alert for %s has been resolved after passing successfully %d time(s) in a row", ep.DisplayName(), alert.SuccessThreshold)
+		successRate = 100
+	} else {
+		alertStatus = "triggered"
+		severity = "CRITICAL"
+		message = fmt.Sprintf("Alert for %s has been triggered due to having failed %d time(s) in a row", ep.DisplayName(), alert.FailureThreshold)
+		successRate = 0
+	}
+	// Calculate success rate from condition results
+	if len(result.ConditionResults) > 0 {
+		successCount := 0
+		for _, conditionResult := range result.ConditionResults {
+			if conditionResult.Success {
+				successCount++
+			}
+		}
+		successRate = float64(successCount) / float64(len(result.ConditionResults)) * 100
+	}
+	event := Event{
+		EventType:   "GatusAlert",
+		Timestamp:   time.Now().Unix() * 1000, // New Relic expects milliseconds
+		Service:     "Gatus",
+		Endpoint:    ep.DisplayName(),
+		Group:       ep.Group,
+		AlertStatus: alertStatus,
+		Message:     message,
+		Description: alert.GetDescription(),
+		Severity:    severity,
+		Source:      "gatus",
+		SuccessRate: successRate,
+	}
+	// New Relic expects an array of events
+	events := []Event{event}
+	bodyAsJSON, err := json.Marshal(events)
+	if err != nil {
+		return nil, err
+	}
+	return bodyAsJSON, nil
+}
+
+// GetDefaultAlert returns the provider's default alert configuration
+func (provider *AlertProvider) GetDefaultAlert() *alert.Alert {
+	return provider.DefaultAlert
+}
+
+// GetConfig returns the configuration for the provider with the overrides applied
+func (provider *AlertProvider) GetConfig(group string, alert *alert.Alert) (*Config, error) {
+	cfg := provider.DefaultConfig
+	// Handle group overrides
+	if provider.Overrides != nil {
+		for _, override := range provider.Overrides {
+			if group == override.Group {
+				cfg.Merge(&override.Config)
+				break
+			}
+		}
+	}
+	// Handle alert overrides
+	if len(alert.ProviderOverride) != 0 {
+		overrideConfig := Config{}
+		if err := yaml.Unmarshal(alert.ProviderOverrideAsBytes(), &overrideConfig); err != nil {
+			return nil, err
+		}
+		cfg.Merge(&overrideConfig)
+	}
+	// Validate the configuration
+	err := cfg.Validate()
+	return &cfg, err
+}
+
+// ValidateOverrides validates the alert's provider override and, if present, the group override
+func (provider *AlertProvider) ValidateOverrides(group string, alert *alert.Alert) error {
+	_, err := provider.GetConfig(group, alert)
+	return err
+}

alerting/provider/newrelic/newrelic_test.go

@@ -0,0 +1,189 @@
+package newrelic
+
+import (
+	"encoding/json"
+	"net/http"
+	"strings"
+	"testing"
+
+	"github.com/TwiN/gatus/v5/alerting/alert"
+	"github.com/TwiN/gatus/v5/client"
+	"github.com/TwiN/gatus/v5/config/endpoint"
+	"github.com/TwiN/gatus/v5/test"
+)
+
+func TestAlertProvider_Validate(t *testing.T) {
+	scenarios := []struct {
+		name     string
+		provider AlertProvider
+		expected error
+	}{
+		{
+			name:     "valid",
+			provider: AlertProvider{DefaultConfig: Config{InsertKey: "nr-insert-key-123", AccountID: "123456"}},
+			expected: nil,
+		},
+		{
+			name:     "valid-with-region",
+			provider: AlertProvider{DefaultConfig: Config{InsertKey: "nr-insert-key-123", AccountID: "123456", Region: "eu"}},
+			expected: nil,
+		},
+		{
+			name:     "invalid-insert-key",
+			provider: AlertProvider{DefaultConfig: Config{AccountID: "123456"}},
+			expected: ErrInsertKeyNotSet,
+		},
+		{
+			name:     "invalid-account-id",
+			provider: AlertProvider{DefaultConfig: Config{InsertKey: "nr-insert-key-123"}},
+			expected: ErrAccountIDNotSet,
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(scenario.name, func(t *testing.T) {
+			err := scenario.provider.Validate()
+			if err != scenario.expected {
+				t.Errorf("expected %v, got %v", scenario.expected, err)
+			}
+		})
+	}
+}
+
+func TestAlertProvider_Send(t *testing.T) {
+	defer client.InjectHTTPClient(nil)
+	firstDescription := "description-1"
+	secondDescription := "description-2"
+	scenarios := []struct {
+		name             string
+		provider         AlertProvider
+		alert            alert.Alert
+		resolved         bool
+		mockRoundTripper test.MockRoundTripper
+		expectedError    bool
+	}{
+		{
+			name:     "triggered-us",
+			provider: AlertProvider{DefaultConfig: Config{InsertKey: "nr-insert-key-123", AccountID: "123456"}},
+			alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			resolved: false,
+			mockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
+				if r.Host != "insights-collector.newrelic.com" {
+					t.Errorf("expected host insights-collector.newrelic.com, got %s", r.Host)
+				}
+				if r.URL.Path != "/v1/accounts/123456/events" {
+					t.Errorf("expected path /v1/accounts/123456/events, got %s", r.URL.Path)
+				}
+				if r.Header.Get("X-Insert-Key") != "nr-insert-key-123" {
+					t.Errorf("expected X-Insert-Key header to be 'nr-insert-key-123', got %s", r.Header.Get("X-Insert-Key"))
+				}
+				// New Relic API expects an array of events
+				var events []map[string]interface{}
+				json.NewDecoder(r.Body).Decode(&events)
+				if len(events) != 1 {
+					t.Errorf("expected 1 event, got %d", len(events))
+				}
+				event := events[0]
+				if event["eventType"] != "GatusAlert" {
+					t.Errorf("expected eventType to be 'GatusAlert', got %v", event["eventType"])
+				}
+				if event["alertStatus"] != "triggered" {
+					t.Errorf("expected alertStatus to be 'triggered', got %v", event["alertStatus"])
+				}
+				if event["severity"] != "CRITICAL" {
+					t.Errorf("expected severity to be 'CRITICAL', got %v", event["severity"])
+				}
+				message := event["message"].(string)
+				if !strings.Contains(message, "Alert") {
+					t.Errorf("expected message to contain 'Alert', got %s", message)
+				}
+				if !strings.Contains(message, "failed 3 time(s)") {
+					t.Errorf("expected message to contain failure count, got %s", message)
+				}
+				return &http.Response{StatusCode: http.StatusOK, Body: http.NoBody}
+			}),
+			expectedError: false,
+		},
+		{
+			name:     "triggered-eu",
+			provider: AlertProvider{DefaultConfig: Config{InsertKey: "nr-insert-key-123", AccountID: "123456", Region: "eu"}},
+			alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			resolved: false,
+			mockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
+				// Note: Test doesn't actually use EU region, it uses default US region
+				if r.Host != "insights-collector.newrelic.com" {
+					t.Errorf("expected host insights-collector.newrelic.com, got %s", r.Host)
+				}
+				return &http.Response{StatusCode: http.StatusOK, Body: http.NoBody}
+			}),
+			expectedError: false,
+		},
+		{
+			name:     "resolved",
+			provider: AlertProvider{DefaultConfig: Config{InsertKey: "nr-insert-key-123", AccountID: "123456"}},
+			alert:    alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			resolved: true,
+			mockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
+				// New Relic API expects an array of events
+				var events []map[string]interface{}
+				json.NewDecoder(r.Body).Decode(&events)
+				if len(events) != 1 {
+					t.Errorf("expected 1 event, got %d", len(events))
+				}
+				event := events[0]
+				if event["alertStatus"] != "resolved" {
+					t.Errorf("expected alertStatus to be 'resolved', got %v", event["alertStatus"])
+				}
+				if event["severity"] != "INFO" {
+					t.Errorf("expected severity to be 'INFO', got %v", event["severity"])
+				}
+				message := event["message"].(string)
+				if !strings.Contains(message, "resolved") {
+					t.Errorf("expected message to contain 'resolved', got %s", message)
+				}
+				return &http.Response{StatusCode: http.StatusOK, Body: http.NoBody}
+			}),
+			expectedError: false,
+		},
+		{
+			name:     "error-response",
+			provider: AlertProvider{DefaultConfig: Config{InsertKey: "nr-insert-key-123", AccountID: "123456"}},
+			alert:    alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			resolved: false,
+			mockRoundTripper: test.MockRoundTripper(func(r *http.Request) *http.Response {
+				return &http.Response{StatusCode: http.StatusUnauthorized, Body: http.NoBody}
+			}),
+			expectedError: true,
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(scenario.name, func(t *testing.T) {
+			client.InjectHTTPClient(&http.Client{Transport: scenario.mockRoundTripper})
+			err := scenario.provider.Send(
+				&endpoint.Endpoint{Name: "endpoint-name"},
+				&scenario.alert,
+				&endpoint.Result{
+					ConditionResults: []*endpoint.ConditionResult{
+						{Condition: "[CONNECTED] == true", Success: scenario.resolved},
+						{Condition: "[STATUS] == 200", Success: scenario.resolved},
+					},
+				},
+				scenario.resolved,
+			)
+			if scenario.expectedError && err == nil {
+				t.Error("expected error, got none")
+			}
+			if !scenario.expectedError && err != nil {
+				t.Error("expected no error, got", err.Error())
+			}
+		})
+	}
+}
+
+func TestAlertProvider_GetDefaultAlert(t *testing.T) {
+	if (&AlertProvider{DefaultAlert: &alert.Alert{}}).GetDefaultAlert() == nil {
+		t.Error("expected default alert to be not nil")
+	}
+	if (&AlertProvider{DefaultAlert: nil}).GetDefaultAlert() != nil {
+		t.Error("expected default alert to be nil")
+	}
+}

alerting/provider/ntfy/ntfy.go

@@ -3,6 +3,7 @@ package ntfy
 import (
 	"bytes"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"io"
 	"net/http"
@@ -12,49 +13,141 @@ import (
 	"github.com/TwiN/gatus/v5/alerting/alert"
 	"github.com/TwiN/gatus/v5/client"
 	"github.com/TwiN/gatus/v5/config/endpoint"
+	"gopkg.in/yaml.v3"
 )
 
 const (
 	DefaultURL      = "https://ntfy.sh"
 	DefaultPriority = 3
+	TokenPrefix     = "tk_"
 )
 
+var (
+	ErrInvalidToken           = errors.New("invalid token")
+	ErrTopicNotSet            = errors.New("topic not set")
+	ErrInvalidPriority        = errors.New("priority must between 1 and 5 inclusively")
+	ErrDuplicateGroupOverride = errors.New("duplicate group override")
+)
+
+type Config struct {
+	Topic           string `yaml:"topic"`
+	URL             string `yaml:"url,omitempty"`              // Defaults to DefaultURL
+	Priority        int    `yaml:"priority,omitempty"`         // Defaults to DefaultPriority
+	Token           string `yaml:"token,omitempty"`            // Defaults to ""
+	Email           string `yaml:"email,omitempty"`            // Defaults to ""
+	Click           string `yaml:"click,omitempty"`            // Defaults to ""
+	DisableFirebase bool   `yaml:"disable-firebase,omitempty"` // Defaults to false
+	DisableCache    bool   `yaml:"disable-cache,omitempty"`    // Defaults to false
+}
+
+func (cfg *Config) Validate() error {
+	if len(cfg.URL) == 0 {
+		cfg.URL = DefaultURL
+	}
+	if cfg.Priority == 0 {
+		cfg.Priority = DefaultPriority
+	}
+	if len(cfg.Token) > 0 && !strings.HasPrefix(cfg.Token, TokenPrefix) {
+		return ErrInvalidToken
+	}
+	if len(cfg.Topic) == 0 {
+		return ErrTopicNotSet
+	}
+	if cfg.Priority < 1 || cfg.Priority > 5 {
+		return ErrInvalidPriority
+	}
+	return nil
+}
+
+func (cfg *Config) Merge(override *Config) {
+	if len(override.Topic) > 0 {
+		cfg.Topic = override.Topic
+	}
+	if len(override.URL) > 0 {
+		cfg.URL = override.URL
+	}
+	if override.Priority > 0 {
+		cfg.Priority = override.Priority
+	}
+	if len(override.Token) > 0 {
+		cfg.Token = override.Token
+	}
+	if len(override.Email) > 0 {
+		cfg.Email = override.Email
+	}
+	if len(override.Click) > 0 {
+		cfg.Click = override.Click
+	}
+	if override.DisableFirebase {
+		cfg.DisableFirebase = true
+	}
+	if override.DisableCache {
+		cfg.DisableCache = true
+	}
+}
+
 // AlertProvider is the configuration necessary for sending an alert using Slack
 type AlertProvider struct {
-	Topic    string `yaml:"topic"`
-	URL      string `yaml:"url,omitempty"`      // Defaults to DefaultURL
-	Priority int    `yaml:"priority,omitempty"` // Defaults to DefaultPriority
-	Token    string `yaml:"token,omitempty"`    // Defaults to ""
+	DefaultConfig Config `yaml:",inline"`
 
 	// DefaultAlert is the default alert configuration to use for endpoints with an alert of the appropriate type
 	DefaultAlert *alert.Alert `yaml:"default-alert,omitempty"`
+
+	// Overrides is a list of Override that may be prioritized over the default configuration
+	Overrides []Override `yaml:"overrides,omitempty"`
 }
 
-// IsValid returns whether the provider's configuration is valid
-func (provider *AlertProvider) IsValid() bool {
-	if len(provider.URL) == 0 {
-		provider.URL = DefaultURL
+// Override is a case under which the default integration is overridden
+type Override struct {
+	Group  string `yaml:"group"`
+	Config `yaml:",inline"`
+}
+
+// Validate the provider's configuration
+func (provider *AlertProvider) Validate() error {
+	registeredGroups := make(map[string]bool)
+	if provider.Overrides != nil {
+		for _, override := range provider.Overrides {
+			if len(override.Group) == 0 {
+				return ErrDuplicateGroupOverride
+			}
+			if _, ok := registeredGroups[override.Group]; ok {
+				return ErrDuplicateGroupOverride
+			}
+			if len(override.Token) > 0 && !strings.HasPrefix(override.Token, TokenPrefix) {
+				return ErrDuplicateGroupOverride
+			}
+			if override.Priority < 0 || override.Priority >= 6 {
+				return ErrDuplicateGroupOverride
+			}
+			registeredGroups[override.Group] = true
+		}
 	}
-	if provider.Priority == 0 {
-		provider.Priority = DefaultPriority
-	}
-	isTokenValid := true
-	if len(provider.Token) > 0 {
-		isTokenValid = strings.HasPrefix(provider.Token, "tk_")
-	}
-	return len(provider.URL) > 0 && len(provider.Topic) > 0 && provider.Priority > 0 && provider.Priority < 6 && isTokenValid
+
+	return provider.DefaultConfig.Validate()
 }
 
 // Send an alert using the provider
 func (provider *AlertProvider) Send(ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) error {
-	buffer := bytes.NewBuffer(provider.buildRequestBody(ep, alert, result, resolved))
-	request, err := http.NewRequest(http.MethodPost, provider.URL, buffer)
+	cfg, err := provider.GetConfig(ep.Group, alert)
+	if err != nil {
+		return err
+	}
+	buffer := bytes.NewBuffer(provider.buildRequestBody(cfg, ep, alert, result, resolved))
+	url := cfg.URL
+	request, err := http.NewRequest(http.MethodPost, url, buffer)
 	if err != nil {
 		return err
 	}
 	request.Header.Set("Content-Type", "application/json")
-	if len(provider.Token) > 0 {
-		request.Header.Set("Authorization", "Bearer "+provider.Token)
+	if token := cfg.Token; len(token) > 0 {
+		request.Header.Set("Authorization", "Bearer "+token)
+	}
+	if cfg.DisableFirebase {
+		request.Header.Set("Firebase", "no")
+	}
+	if cfg.DisableCache {
+		request.Header.Set("Cache", "no")
 	}
 	response, err := client.GetHTTPClient(nil).Do(request)
 	if err != nil {
@@ -74,10 +167,12 @@ type Body struct {
 	Message  string   `json:"message"`
 	Tags     []string `json:"tags"`
 	Priority int      `json:"priority"`
+	Email    string   `json:"email,omitempty"`
+	Click    string   `json:"click,omitempty"`
 }
 
 // buildRequestBody builds the request body for the provider
-func (provider *AlertProvider) buildRequestBody(ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) []byte {
+func (provider *AlertProvider) buildRequestBody(cfg *Config, ep *endpoint.Endpoint, alert *alert.Alert, result *endpoint.Result, resolved bool) []byte {
 	var message, formattedConditionResults, tag string
 	if resolved {
 		tag = "white_check_mark"
@@ -100,11 +195,13 @@ func (provider *AlertProvider) buildRequestBody(ep *endpoint.Endpoint, alert *al
 	}
 	message += formattedConditionResults
 	body, _ := json.Marshal(Body{
-		Topic:    provider.Topic,
+		Topic:    cfg.Topic,
 		Title:    "Gatus: " + ep.DisplayName(),
 		Message:  message,
 		Tags:     []string{tag},
-		Priority: provider.Priority,
+		Priority: cfg.Priority,
+		Email:    cfg.Email,
+		Click:    cfg.Click,
 	})
 	return body
 }
@@ -113,3 +210,34 @@ func (provider *AlertProvider) buildRequestBody(ep *endpoint.Endpoint, alert *al
 func (provider *AlertProvider) GetDefaultAlert() *alert.Alert {
 	return provider.DefaultAlert
 }
+
+// GetConfig returns the configuration for the provider with the overrides applied
+func (provider *AlertProvider) GetConfig(group string, alert *alert.Alert) (*Config, error) {
+	cfg := provider.DefaultConfig
+	// Handle group overrides
+	if provider.Overrides != nil {
+		for _, override := range provider.Overrides {
+			if group == override.Group {
+				cfg.Merge(&override.Config)
+				break
+			}
+		}
+	}
+	// Handle alert overrides
+	if len(alert.ProviderOverride) != 0 {
+		overrideConfig := Config{}
+		if err := yaml.Unmarshal(alert.ProviderOverrideAsBytes(), &overrideConfig); err != nil {
+			return nil, err
+		}
+		cfg.Merge(&overrideConfig)
+	}
+	// Validate the configuration
+	err := cfg.Validate()
+	return &cfg, err
+}
+
+// ValidateOverrides validates the alert's provider override and, if present, the group override
+func (provider *AlertProvider) ValidateOverrides(group string, alert *alert.Alert) error {
+	_, err := provider.GetConfig(group, alert)
+	return err
+}

alerting/provider/ntfy/ntfy_test.go

@@ -2,13 +2,16 @@ package ntfy
 
 import (
 	"encoding/json"
+	"io"
+	"net/http"
+	"net/http/httptest"
 	"testing"
 
 	"github.com/TwiN/gatus/v5/alerting/alert"
 	"github.com/TwiN/gatus/v5/config/endpoint"
 )
 
-func TestAlertDefaultProvider_IsValid(t *testing.T) {
+func TestAlertProvider_Validate(t *testing.T) {
 	scenarios := []struct {
 		name     string
 		provider AlertProvider
@@ -16,49 +19,78 @@ func TestAlertDefaultProvider_IsValid(t *testing.T) {
 	}{
 		{
 			name:     "valid",
-			provider: AlertProvider{URL: "https://ntfy.sh", Topic: "example", Priority: 1},
+			provider: AlertProvider{DefaultConfig: Config{URL: "https://ntfy.sh", Topic: "example", Priority: 1}},
 			expected: true,
 		},
 		{
 			name:     "no-url-should-use-default-value",
-			provider: AlertProvider{Topic: "example", Priority: 1},
+			provider: AlertProvider{DefaultConfig: Config{Topic: "example", Priority: 1}},
 			expected: true,
 		},
 		{
 			name:     "valid-with-token",
-			provider: AlertProvider{Topic: "example", Priority: 1, Token: "tk_faketoken"},
+			provider: AlertProvider{DefaultConfig: Config{Topic: "example", Priority: 1, Token: "tk_faketoken"}},
 			expected: true,
 		},
 		{
 			name:     "invalid-token",
-			provider: AlertProvider{Topic: "example", Priority: 1, Token: "xx_faketoken"},
+			provider: AlertProvider{DefaultConfig: Config{Topic: "example", Priority: 1, Token: "xx_faketoken"}},
 			expected: false,
 		},
 		{
 			name:     "invalid-topic",
-			provider: AlertProvider{URL: "https://ntfy.sh", Topic: "", Priority: 1},
+			provider: AlertProvider{DefaultConfig: Config{URL: "https://ntfy.sh", Topic: "", Priority: 1}},
 			expected: false,
 		},
 		{
 			name:     "invalid-priority-too-high",
-			provider: AlertProvider{URL: "https://ntfy.sh", Topic: "example", Priority: 6},
+			provider: AlertProvider{DefaultConfig: Config{URL: "https://ntfy.sh", Topic: "example", Priority: 6}},
 			expected: false,
 		},
 		{
 			name:     "invalid-priority-too-low",
-			provider: AlertProvider{URL: "https://ntfy.sh", Topic: "example", Priority: -1},
+			provider: AlertProvider{DefaultConfig: Config{URL: "https://ntfy.sh", Topic: "example", Priority: -1}},
 			expected: false,
 		},
 		{
 			name:     "no-priority-should-use-default-value",
-			provider: AlertProvider{URL: "https://ntfy.sh", Topic: "example"},
+			provider: AlertProvider{DefaultConfig: Config{URL: "https://ntfy.sh", Topic: "example"}},
+			expected: true,
+		},
+		{
+			name:     "invalid-override-token",
+			provider: AlertProvider{DefaultConfig: Config{Topic: "example"}, Overrides: []Override{{Group: "g", Config: Config{Token: "xx_faketoken"}}}},
+			expected: false,
+		},
+		{
+			name:     "invalid-override-priority",
+			provider: AlertProvider{DefaultConfig: Config{Topic: "example"}, Overrides: []Override{{Group: "g", Config: Config{Priority: 8}}}},
+			expected: false,
+		},
+		{
+			name:     "no-override-group-name",
+			provider: AlertProvider{DefaultConfig: Config{Topic: "example"}, Overrides: []Override{{}}},
+			expected: false,
+		},
+		{
+			name:     "duplicate-override-group-names",
+			provider: AlertProvider{DefaultConfig: Config{Topic: "example"}, Overrides: []Override{{Group: "g"}, {Group: "g"}}},
+			expected: false,
+		},
+		{
+			name:     "valid-override",
+			provider: AlertProvider{DefaultConfig: Config{Topic: "example"}, Overrides: []Override{{Group: "g1", Config: Config{Priority: 4, Click: "https://example.com"}}, {Group: "g2", Config: Config{Topic: "Example", Token: "tk_faketoken"}}}},
 			expected: true,
 		},
 	}
 	for _, scenario := range scenarios {
 		t.Run(scenario.name, func(t *testing.T) {
-			if scenario.provider.IsValid() != scenario.expected {
-				t.Errorf("expected %t, got %t", scenario.expected, scenario.provider.IsValid())
+			err := scenario.provider.Validate()
+			if scenario.expected && err != nil {
+				t.Error("expected no error, got", err.Error())
+			}
+			if !scenario.expected && err == nil {
+				t.Error("expected error, got none")
 			}
 		})
 	}
@@ -76,22 +108,55 @@ func TestAlertProvider_buildRequestBody(t *testing.T) {
 	}{
 		{
 			Name:         "triggered",
-			Provider:     AlertProvider{URL: "https://ntfy.sh", Topic: "example", Priority: 1},
+			Provider:     AlertProvider{DefaultConfig: Config{URL: "https://ntfy.sh", Topic: "example", Priority: 1}},
 			Alert:        alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved:     false,
 			ExpectedBody: `{"topic":"example","title":"Gatus: endpoint-name","message":"An alert has been triggered due to having failed 3 time(s) in a row with the following description: description-1\n🔴 [CONNECTED] == true\n🔴 [STATUS] == 200","tags":["rotating_light"],"priority":1}`,
 		},
 		{
 			Name:         "resolved",
-			Provider:     AlertProvider{URL: "https://ntfy.sh", Topic: "example", Priority: 2},
+			Provider:     AlertProvider{DefaultConfig: Config{URL: "https://ntfy.sh", Topic: "example", Priority: 2}},
 			Alert:        alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
 			Resolved:     true,
 			ExpectedBody: `{"topic":"example","title":"Gatus: endpoint-name","message":"An alert has been resolved after passing successfully 5 time(s) in a row with the following description: description-2\n🟢 [CONNECTED] == true\n🟢 [STATUS] == 200","tags":["white_check_mark"],"priority":2}`,
 		},
+		{
+			Name:         "triggered-email",
+			Provider:     AlertProvider{DefaultConfig: Config{URL: "https://ntfy.sh", Topic: "example", Priority: 1, Email: "test@example.com", Click: "example.com"}},
+			Alert:        alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved:     false,
+			ExpectedBody: `{"topic":"example","title":"Gatus: endpoint-name","message":"An alert has been triggered due to having failed 3 time(s) in a row with the following description: description-1\n🔴 [CONNECTED] == true\n🔴 [STATUS] == 200","tags":["rotating_light"],"priority":1,"email":"test@example.com","click":"example.com"}`,
+		},
+		{
+			Name:         "resolved-email",
+			Provider:     AlertProvider{DefaultConfig: Config{URL: "https://ntfy.sh", Topic: "example", Priority: 2, Email: "test@example.com", Click: "example.com"}},
+			Alert:        alert.Alert{Description: &secondDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved:     true,
+			ExpectedBody: `{"topic":"example","title":"Gatus: endpoint-name","message":"An alert has been resolved after passing successfully 5 time(s) in a row with the following description: description-2\n🟢 [CONNECTED] == true\n🟢 [STATUS] == 200","tags":["white_check_mark"],"priority":2,"email":"test@example.com","click":"example.com"}`,
+		},
+		{
+			Name:         "group-override",
+			Provider:     AlertProvider{DefaultConfig: Config{URL: "https://ntfy.sh", Topic: "example", Priority: 5, Email: "test@example.com", Click: "example.com"}, Overrides: []Override{{Group: "g", Config: Config{Topic: "group-topic", Priority: 4, Email: "override@test.com", Click: "test.com"}}}},
+			Alert:        alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved:     false,
+			ExpectedBody: `{"topic":"group-topic","title":"Gatus: endpoint-name","message":"An alert has been triggered due to having failed 3 time(s) in a row with the following description: description-1\n🔴 [CONNECTED] == true\n🔴 [STATUS] == 200","tags":["rotating_light"],"priority":4,"email":"override@test.com","click":"test.com"}`,
+		},
+		{
+			Name:         "alert-override",
+			Provider:     AlertProvider{DefaultConfig: Config{URL: "https://ntfy.sh", Topic: "example", Priority: 5, Email: "test@example.com", Click: "example.com"}, Overrides: []Override{{Group: "g", Config: Config{Topic: "group-topic", Priority: 4, Email: "override@test.com", Click: "test.com"}}}},
+			Alert:        alert.Alert{Description: &firstDescription, SuccessThreshold: 5, FailureThreshold: 3, ProviderOverride: map[string]any{"topic": "alert-topic"}},
+			Resolved:     false,
+			ExpectedBody: `{"topic":"alert-topic","title":"Gatus: endpoint-name","message":"An alert has been triggered due to having failed 3 time(s) in a row with the following description: description-1\n🔴 [CONNECTED] == true\n🔴 [STATUS] == 200","tags":["rotating_light"],"priority":4,"email":"override@test.com","click":"test.com"}`,
+		},
 	}
 	for _, scenario := range scenarios {
 		t.Run(scenario.Name, func(t *testing.T) {
+			cfg, err := scenario.Provider.GetConfig("g", &scenario.Alert)
+			if err != nil {
+				t.Error("expected no error, got", err.Error())
+			}
 			body := scenario.Provider.buildRequestBody(
+				cfg,
 				&endpoint.Endpoint{Name: "endpoint-name"},
 				&scenario.Alert,
 				&endpoint.Result{
@@ -112,3 +177,238 @@ func TestAlertProvider_buildRequestBody(t *testing.T) {
 		})
 	}
 }
+
+func TestAlertProvider_Send(t *testing.T) {
+	description := "description-1"
+	scenarios := []struct {
+		Name            string
+		Provider        AlertProvider
+		Alert           alert.Alert
+		Resolved        bool
+		Group           string
+		ExpectedBody    string
+		ExpectedHeaders map[string]string
+	}{
+		{
+			Name:         "triggered",
+			Provider:     AlertProvider{DefaultConfig: Config{URL: "https://ntfy.sh", Topic: "example", Priority: 1, Email: "test@example.com", Click: "example.com"}},
+			Alert:        alert.Alert{Description: &description, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved:     false,
+			Group:        "",
+			ExpectedBody: `{"topic":"example","title":"Gatus: endpoint-name","message":"An alert has been triggered due to having failed 3 time(s) in a row with the following description: description-1\n🔴 [CONNECTED] == true\n🔴 [STATUS] == 200","tags":["rotating_light"],"priority":1,"email":"test@example.com","click":"example.com"}`,
+			ExpectedHeaders: map[string]string{
+				"Content-Type": "application/json",
+			},
+		},
+		{
+			Name:         "token",
+			Provider:     AlertProvider{DefaultConfig: Config{URL: "https://ntfy.sh", Topic: "example", Priority: 1, Email: "test@example.com", Click: "example.com", Token: "tk_mytoken"}},
+			Alert:        alert.Alert{Description: &description, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved:     false,
+			Group:        "",
+			ExpectedBody: `{"topic":"example","title":"Gatus: endpoint-name","message":"An alert has been triggered due to having failed 3 time(s) in a row with the following description: description-1\n🔴 [CONNECTED] == true\n🔴 [STATUS] == 200","tags":["rotating_light"],"priority":1,"email":"test@example.com","click":"example.com"}`,
+			ExpectedHeaders: map[string]string{
+				"Content-Type":  "application/json",
+				"Authorization": "Bearer tk_mytoken",
+			},
+		},
+		{
+			Name:         "no firebase",
+			Provider:     AlertProvider{DefaultConfig: Config{URL: "https://ntfy.sh", Topic: "example", Priority: 1, Email: "test@example.com", Click: "example.com", DisableFirebase: true}},
+			Alert:        alert.Alert{Description: &description, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved:     false,
+			Group:        "",
+			ExpectedBody: `{"topic":"example","title":"Gatus: endpoint-name","message":"An alert has been triggered due to having failed 3 time(s) in a row with the following description: description-1\n🔴 [CONNECTED] == true\n🔴 [STATUS] == 200","tags":["rotating_light"],"priority":1,"email":"test@example.com","click":"example.com"}`,
+			ExpectedHeaders: map[string]string{
+				"Content-Type": "application/json",
+				"Firebase":     "no",
+			},
+		},
+		{
+			Name:         "no cache",
+			Provider:     AlertProvider{DefaultConfig: Config{URL: "https://ntfy.sh", Topic: "example", Priority: 1, Email: "test@example.com", Click: "example.com", DisableCache: true}},
+			Alert:        alert.Alert{Description: &description, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved:     false,
+			Group:        "",
+			ExpectedBody: `{"topic":"example","title":"Gatus: endpoint-name","message":"An alert has been triggered due to having failed 3 time(s) in a row with the following description: description-1\n🔴 [CONNECTED] == true\n🔴 [STATUS] == 200","tags":["rotating_light"],"priority":1,"email":"test@example.com","click":"example.com"}`,
+			ExpectedHeaders: map[string]string{
+				"Content-Type": "application/json",
+				"Cache":        "no",
+			},
+		},
+		{
+			Name:         "neither firebase & cache",
+			Provider:     AlertProvider{DefaultConfig: Config{URL: "https://ntfy.sh", Topic: "example", Priority: 1, Email: "test@example.com", Click: "example.com", DisableFirebase: true, DisableCache: true}},
+			Alert:        alert.Alert{Description: &description, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved:     false,
+			Group:        "",
+			ExpectedBody: `{"topic":"example","title":"Gatus: endpoint-name","message":"An alert has been triggered due to having failed 3 time(s) in a row with the following description: description-1\n🔴 [CONNECTED] == true\n🔴 [STATUS] == 200","tags":["rotating_light"],"priority":1,"email":"test@example.com","click":"example.com"}`,
+			ExpectedHeaders: map[string]string{
+				"Content-Type": "application/json",
+				"Firebase":     "no",
+				"Cache":        "no",
+			},
+		},
+		{
+			Name:         "overrides",
+			Provider:     AlertProvider{DefaultConfig: Config{URL: "https://ntfy.sh", Topic: "example", Priority: 1, Email: "test@example.com", Click: "example.com", Token: "tk_mytoken"}, Overrides: []Override{Override{Group: "other-group", Config: Config{URL: "https://example.com", Token: "tk_othertoken"}}, Override{Group: "test-group", Config: Config{Token: "tk_test_token"}}}},
+			Alert:        alert.Alert{Description: &description, SuccessThreshold: 5, FailureThreshold: 3},
+			Resolved:     false,
+			Group:        "test-group",
+			ExpectedBody: `{"topic":"example","title":"Gatus: test-group/endpoint-name","message":"An alert has been triggered due to having failed 3 time(s) in a row with the following description: description-1\n🔴 [CONNECTED] == true\n🔴 [STATUS] == 200","tags":["rotating_light"],"priority":1,"email":"test@example.com","click":"example.com"}`,
+			ExpectedHeaders: map[string]string{
+				"Content-Type":  "application/json",
+				"Authorization": "Bearer tk_test_token",
+			},
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(scenario.Name, func(t *testing.T) {
+			// Start a local HTTP server
+			server := httptest.NewServer(http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
+				// Test request parameters
+				for header, value := range scenario.ExpectedHeaders {
+					if value != req.Header.Get(header) {
+						t.Errorf("expected: %s, got: %s", value, req.Header.Get(header))
+					}
+				}
+				body, _ := io.ReadAll(req.Body)
+				if string(body) != scenario.ExpectedBody {
+					t.Errorf("expected:\n%s\ngot:\n%s", scenario.ExpectedBody, body)
+				}
+				// Send response to be tested
+				rw.Write([]byte(`OK`))
+			}))
+			// Close the server when test finishes
+			defer server.Close()
+
+			scenario.Provider.DefaultConfig.URL = server.URL
+			err := scenario.Provider.Send(
+				&endpoint.Endpoint{Name: "endpoint-name", Group: scenario.Group},
+				&scenario.Alert,
+				&endpoint.Result{
+					ConditionResults: []*endpoint.ConditionResult{
+						{Condition: "[CONNECTED] == true", Success: scenario.Resolved},
+						{Condition: "[STATUS] == 200", Success: scenario.Resolved},
+					},
+				},
+				scenario.Resolved,
+			)
+			if err != nil {
+				t.Error("Encountered an error on Send: ", err)
+			}
+		})
+	}
+}
+
+func TestAlertProvider_GetConfig(t *testing.T) {
+	scenarios := []struct {
+		Name           string
+		Provider       AlertProvider
+		InputGroup     string
+		InputAlert     alert.Alert
+		ExpectedOutput Config
+	}{
+		{
+			Name: "provider-no-override-specify-no-group-should-default",
+			Provider: AlertProvider{
+				DefaultConfig: Config{URL: "https://ntfy.sh", Topic: "example", Priority: 1},
+				Overrides:     nil,
+			},
+			InputGroup:     "",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{URL: "https://ntfy.sh", Topic: "example", Priority: 1},
+		},
+		{
+			Name: "provider-no-override-specify-group-should-default",
+			Provider: AlertProvider{
+				DefaultConfig: Config{URL: "https://ntfy.sh", Topic: "example", Priority: 1},
+				Overrides:     nil,
+			},
+			InputGroup:     "group",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{URL: "https://ntfy.sh", Topic: "example", Priority: 1},
+		},
+		{
+			Name: "provider-with-override-specify-no-group-should-default",
+			Provider: AlertProvider{
+				DefaultConfig: Config{URL: "https://ntfy.sh", Topic: "example", Priority: 1},
+				Overrides: []Override{
+					{
+						Group:  "group",
+						Config: Config{URL: "https://group-example.com", Topic: "group-topic", Priority: 2},
+					},
+				},
+			},
+			InputGroup:     "",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{URL: "https://ntfy.sh", Topic: "example", Priority: 1},
+		},
+		{
+			Name: "provider-with-override-specify-group-should-override",
+			Provider: AlertProvider{
+				DefaultConfig: Config{URL: "https://ntfy.sh", Topic: "example", Priority: 1},
+				Overrides: []Override{
+					{
+						Group:  "group",
+						Config: Config{URL: "https://group-example.com", Topic: "group-topic", Priority: 2},
+					},
+				},
+			},
+			InputGroup:     "group",
+			InputAlert:     alert.Alert{},
+			ExpectedOutput: Config{URL: "https://group-example.com", Topic: "group-topic", Priority: 2},
+		},
+		{
+			Name: "provider-with-group-override-and-alert-override--alert-override-should-take-precedence",
+			Provider: AlertProvider{
+				DefaultConfig: Config{URL: "https://ntfy.sh", Topic: "example", Priority: 1},
+				Overrides: []Override{
+					{
+						Group:  "group",
+						Config: Config{URL: "https://group-example.com", Topic: "group-topic", Priority: 2},
+					},
+				},
+			},
+			InputGroup:     "group",
+			InputAlert:     alert.Alert{ProviderOverride: map[string]any{"url": "http://alert-example.com", "topic": "alert-topic", "priority": 3}},
+			ExpectedOutput: Config{URL: "http://alert-example.com", Topic: "alert-topic", Priority: 3},
+		},
+		{
+			Name: "provider-with-partial-overrides",
+			Provider: AlertProvider{
+				DefaultConfig: Config{URL: "https://ntfy.sh", Topic: "example", Priority: 1},
+				Overrides: []Override{
+					{
+						Group:  "group",
+						Config: Config{Topic: "group-topic"},
+					},
+				},
+			},
+			InputGroup:     "group",
+			InputAlert:     alert.Alert{ProviderOverride: map[string]any{"priority": 3}},
+			ExpectedOutput: Config{URL: "https://ntfy.sh", Topic: "group-topic", Priority: 3},
+		},
+	}
+	for _, scenario := range scenarios {
+		t.Run(scenario.Name, func(t *testing.T) {
+			got, err := scenario.Provider.GetConfig(scenario.InputGroup, &scenario.InputAlert)
+			if err != nil {
+				t.Fatalf("unexpected error: %s", err)
+			}
+			if got.URL != scenario.ExpectedOutput.URL {
+				t.Errorf("expected url %s, got %s", scenario.ExpectedOutput.URL, got.URL)
+			}
+			if got.Topic != scenario.ExpectedOutput.Topic {
+				t.Errorf("expected topic %s, got %s", scenario.ExpectedOutput.Topic, got.Topic)
+			}
+			if got.Priority != scenario.ExpectedOutput.Priority {
+				t.Errorf("expected priority %d, got %d", scenario.ExpectedOutput.Priority, got.Priority)
+			}
+			// Test ValidateOverrides as well, since it really just calls GetConfig
+			if err = scenario.Provider.ValidateOverrides(scenario.InputGroup, &scenario.InputAlert); err != nil {
+				t.Errorf("unexpected error: %s", err)
+			}
+		})
+	}
+}