deploy/docs/operator-manual/notifications/templates.md

The notification template is used to generate the notification content and is configured in the argocd-notifications-cm ConfigMap. The template is leveraging the html/template golang package and allows customization of the notification message. Templates are meant to be reusable and can be referenced by multiple triggers.

The following template is used to notify the user about application sync status.

apiVersion: v1
kind: ConfigMap
metadata:
  name: argocd-notifications-cm
data:
  template.my-custom-template-slack-template: |
    message: |
      Application {{.app.metadata.name}} sync is {{.app.status.sync.status}}.
      Application details: {{.context.argocdUrl}}/applications/{{.app.metadata.name}}.

Each template has access to the following fields:

• app holds the application object.
• appProject holds the AppProject object associated with the application. This provides access to project-level details like RBAC roles, policies, source repository restrictions, and destination cluster restrictions.
• context is a user-defined string map and might include any string keys and values.
• secrets provides access to sensitive data stored in argocd-notifications-secret
• serviceType holds the notification service type name (such as "slack" or "email"). The field can be used to conditionally render service-specific fields.
• recipient holds the recipient name.

Defining user-defined context

It is possible to define some shared context between all notification templates by setting a top-level YAML document of key-value pairs, which can then be used within templates, like so:

apiVersion: v1
kind: ConfigMap
metadata:
  name: argocd-notifications-cm
data:
  context: |
    region: east
    environmentName: staging

  template.a-slack-template-with-context: |
    message: "Something happened in {{ .context.environmentName }} in the {{ .context.region }} data center!"

Using AppProject information in templates

Templates can access the AppProject associated with an Application using the appProject variable. This is useful for including project-level information such as RBAC policies, source repositories, and destination clusters in notifications.

apiVersion: v1
kind: ConfigMap
metadata:
  name: argocd-notifications-cm
data:
  template.app-project-info: |
    message: |
      Application {{.app.metadata.name}} belongs to project {{.appProject.metadata.name}}.
      Project description: {{.appProject.spec.description}}
      Allowed source repositories: {{range .appProject.spec.sourceRepos}}{{.}} {{end}}
  
  template.app-rbac-policies: |
    message: |
      Application: {{.app.metadata.name}}
      Project: {{.appProject.metadata.name}}
      RBAC Roles:
      {{range .appProject.spec.roles}}
      - Role: {{.name}}
        Policies: {{range .policies}}{{.}} {{end}}
      {{end}}

Defining and using secrets within notification templates

Some notification service use cases will require the use of secrets within templates. This can be achieved with the use of the secrets data variable available within the templates.

Given that we have the following argocd-notifications-secret:

apiVersion: v1
kind: Secret
metadata:
  name: argocd-notifications-secret
stringData:
  sampleWebhookToken: secret-token
type: Opaque

We can use the defined sampleWebhookToken in a template as such:

apiVersion: v1
kind: ConfigMap
metadata:
  name: argocd-notifications-cm
data:
  template.trigger-webhook: |
      webhook:
        sample-webhook:
          method: POST
          path: 'webhook/endpoint/with/auth'
          body: 'token={{ .secrets.sampleWebhookToken }}&variables[APP_SOURCE_PATH]={{ .app.spec.source.path }}

Notification Service Specific Fields

The message field of the template definition allows creating a basic notification for any notification service. You can leverage notification service-specific fields to create complex notifications. For example, using service-specific fields you can add blocks and attachments for Slack, subject for Email or URL path, and body for Webhook. See corresponding service documentation for more information.

Change the timezone

To change the timezone used when formatting time values in notifications, see Configuring the local timezone.

Functions

Templates have access to the set of built-in functions such as the functions of the Sprig package

apiVersion: v1
kind: ConfigMap
metadata:
  name: argocd-notifications-cm
data:
  template.my-custom-template-slack-template: |
    message: "Author: {{(call .repo.GetCommitMetadata .app.status.sync.revision).Author}}"

{!docs/operator-manual/notifications/functions.md!}