Slack

If you want to send message using incoming webhook, you can use webhook.

Parameters

The Slack notification service configuration includes following settings:

Configuration

1. Create Slack Application using https://api.slack.com/apps?new_app=1

2. Once application is created navigate to OAuth & Permissions

3. Go to Scopes > Bot Token Scopes > Add an OAuth Scope. Add chat:write scope. To use the optional username and icon overrides in the Slack notification service also add the chat:write.customize scope.

4. OAuth & Permission > OAuth Tokens for Your Workspace > Install to Workspace

5. Once installation is completed copy the OAuth token.

6. Create a public or private channel, for this example my_channel

7. Invite your slack bot to this channel otherwise slack bot won't be able to deliver notifications to this channel

8. Store Oauth access token in argocd-notifications-secret secret

   yamlCopy

     apiVersion: v1
     kind: Secret
     metadata:
         name: <secret-name>
     stringData:
         slack-token: <Oauth-access-token>
   

9. Define service type slack in data section of argocd-notifications-cm configmap:

   yamlCopy

     apiVersion: v1
     kind: ConfigMap
     metadata:
       name: argocd-notifications-cm
     data:
       service.slack: |
         token: $slack-token
   

10. Add annotation in application yaml file to enable notifications for specific argocd app. The following example uses the on-sync-succeeded trigger:

    yamlCopy

      apiVersion: argoproj.io/v1alpha1
      kind: Application
      metadata:
        annotations:
          notifications.argoproj.io/subscribe.on-sync-succeeded.slack: my_channel
    

11. Annotation with more than one trigger, with multiple destinations and recipients

    yamlCopy

      apiVersion: argoproj.io/v1alpha1
      kind: Application
      metadata:
        annotations:
          notifications.argoproj.io/subscriptions: |
            - trigger: [on-scaling-replica-set, on-rollout-updated, on-rollout-step-completed]
              destinations:
                - service: slack
                  recipients: [my-channel-1, my-channel-2]
                - service: email
                  recipients: [recipient-1, recipient-2, recipient-3 ]
            - trigger: [on-rollout-aborted, on-analysis-run-failed, on-analysis-run-error]
              destinations:
                - service: slack
                  recipients: [my-channel-21, my-channel-22]
    

Templates

Notification templates can be customized to leverage slack message blocks and attachments feature.

The message blocks and attachments can be specified in blocks and attachments string fields under slack field:

template.app-sync-status: |
  message: |
    Application {{.app.metadata.name}} sync is {{.app.status.sync.status}}.
    Application details: {{.context.argocdUrl}}/applications/{{.app.metadata.name}}.
  slack:
    attachments: |
      [{
        "title": "{{.app.metadata.name}}",
        "title_link": "{{.context.argocdUrl}}/applications/{{.app.metadata.name}}",
        "color": "#18be52",
        "fields": [{
          "title": "Sync Status",
          "value": "{{.app.status.sync.status}}",
          "short": true
        }, {
          "title": "Repository",
          "value": "{{.app.spec.source.repoURL}}",
          "short": true
        }]
      }]

If you want to specify an icon and username for each message, you can specify values for username and icon in the slack field. For icon you can specify emoji and image URL, just like in the service definition. If you set username and icon in template, the values set in template will be used even if values are specified in the service definition.

template.app-sync-status: |
  message: |
    Application {{.app.metadata.name}} sync is {{.app.status.sync.status}}.
    Application details: {{.context.argocdUrl}}/applications/{{.app.metadata.name}}.
  slack:
    username: "testbot"
    icon: https://example.com/image.png
    attachments: |
      [{
        "title": "{{.app.metadata.name}}",
        "title_link": "{{.context.argocdUrl}}/applications/{{.app.metadata.name}}",
        "color": "#18be52",
        "fields": [{
          "title": "Sync Status",
          "value": "{{.app.status.sync.status}}",
          "short": true
        }, {
          "title": "Repository",
          "value": "{{.app.spec.source.repoURL}}",
          "short": true
        }]
      }]

The messages can be aggregated to the slack threads by grouping key which can be specified in a groupingKey string field under slack field. groupingKey is used across each template and works independently on each slack channel. When multiple applications will be updated at the same time or frequently, the messages in slack channel can be easily read by aggregating with git commit hash, application name, etc. Furthermore, the messages can be broadcast to the channel at the specific template by notifyBroadcast field.

template.app-sync-status: |
  message: |
    Application {{.app.metadata.name}} sync is {{.app.status.sync.status}}.
    Application details: {{.context.argocdUrl}}/applications/{{.app.metadata.name}}.
  slack:
    attachments: |
      [{
        "title": "{{.app.metadata.name}}",
        "title_link": "{{.context.argocdUrl}}/applications/{{.app.metadata.name}}",
        "color": "#18be52",
        "fields": [{
          "title": "Sync Status",
          "value": "{{.app.status.sync.status}}",
          "short": true
        }, {
          "title": "Repository",
          "value": "{{.app.spec.source.repoURL}}",
          "short": true
        }]
      }]
    # Aggregate the messages to the thread by git commit hash
    groupingKey: "{{.app.status.sync.revision}}"
    notifyBroadcast: false
template.app-sync-failed: |
  message: |
    Application {{.app.metadata.name}} sync is {{.app.status.sync.status}}.
    Application details: {{.context.argocdUrl}}/applications/{{.app.metadata.name}}.
  slack:
    attachments: |
      [{
        "title": "{{.app.metadata.name}}",
        "title_link": "{{.context.argocdUrl}}/applications/{{.app.metadata.name}}",
        "color": "#ff0000",
        "fields": [{
          "title": "Sync Status",
          "value": "{{.app.status.sync.status}}",
          "short": true
        }, {
          "title": "Repository",
          "value": "{{.app.spec.source.repoURL}}",
          "short": true
        }]
      }]
    # Aggregate the messages to the thread by git commit hash
    groupingKey: "{{.app.status.sync.revision}}"
    notifyBroadcast: true

The message is sent according to the deliveryPolicy string field under the slack field. The available modes are Post (default), PostAndUpdate, and Update. The PostAndUpdate and Update settings require groupingKey to be set.