Maven / ArgoCD interview questions

How does ArgoCD handle notifications and what channels does it support?

ArgoCD Notifications is a separate controller (shipped as part of the ArgoCD Helm chart and optionally in the install manifest) that sends alerts and messages when ArgoCD Application events occur. It subscribes to Application state changes and triggers configured notification services when conditions are met.

The notification system has three components:

Triggers: conditions that activate a notification (e.g., on-sync-succeeded, on-health-degraded, on-sync-failed). You can also write custom trigger expressions.
Templates: message content rendered as text or structured blocks (Slack attachments, email HTML). Templates use Go template syntax and have access to the Application object.
Services: the channels where messages are sent. Configured in a Secret (argocd-notifications-secret) and a ConfigMap (argocd-notifications-cm).

Supported notification channels include: Slack, Microsoft Teams, Email (SMTP), PagerDuty, OpsGenie, GitHub (commit status), Bitbucket, Grafana annotations, Rocketchat, Telegram, Webhook (generic HTTP), and more via community contributions.

# Subscribe an Application to a notification
metadata:
  annotations:
    notifications.argoproj.io/subscribe.on-sync-failed.slack: my-deployments-channel
    notifications.argoproj.io/subscribe.on-health-degraded.pagerduty: "true"

Subscriptions are set as annotations on the Application resource. This means different teams can subscribe their applications to different channels without central coordination, and the configuration lives in Git alongside the Application manifest.

How do you subscribe an ArgoCD Application to receive Slack notifications on sync failure?Add an annotation notifications.argoproj.io/subscribe.on-sync-failed.slack: channel-name to the Application

✓ Well done! Notification subscriptions are annotation-based, keeping them co-located with the Application manifest in Git.

Add the Application name to the slack.subscriptions list in argocd-notifications-cm

✗ Try again — subscriptions are set as annotations on the Application, not as entries in the notifications ConfigMap.

Configure a PostSync hook Job that calls the Slack API directly

✗ Try again — that works but is not the ArgoCD Notifications approach; it bypasses the notifications controller entirely.

Where are ArgoCD Notifications service credentials (e.g., Slack token) stored?In the argocd-cm ConfigMap alongside other ArgoCD configuration

✗ Try again — credentials are stored in the argocd-notifications-secret Secret, not in a ConfigMap.

In the argocd-notifications-secret Kubernetes Secret

✓ Well done! Sensitive service credentials like API tokens are stored in argocd-notifications-secret.

Directly in the Application annotations as base64-encoded values

✗ Try again — storing credentials in annotations would expose them in Git; they are kept in a Secret.

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Maven / ArgoCD interview questions

How does ArgoCD handle notifications and what channels does it support?

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