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How long does ArgoCD wait between sync waves? What is a PreSync hook typically used for? What is a PostSync hook typically used for? Can hooks use sync waves to order among themselves? How do you seed initial data on first deployment only? How do hooks differ from plain resources with sync waves, and when do you choose each? How do you order a multi-tier application deployment with waves? How do you run post-deployment smoke tests and fail the sync if they fail? How do you coordinate hooks across multiple Applications (e.g., App of Apps)? What is a SyncFail hook and how is it used?
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How do you notify an external system after a successful deployment using hooks?

Intermediate

Answer

Add a PostSync hook Job that calls the external system (webhook, deployment tracker, ChatOps). Because it runs only after resources are Healthy, it reliably signals a completed deployment. Alternatively, use the Notifications controller for event-driven alerts without a hook.
metadata:
  annotations:
    argocd.argoproj.io/hook: PostSync
Real-world example A PostSync hook posts a 'deployed' event to the release dashboard once the app is healthy.

Common follow-ups: Hook vs Notifications controller for alerts? | Why PostSync for deployment notifications?

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All 29 Sync Waves & Hooks questions