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How do you annotate a resource with a sync wave? What are the hook deletion policy options? What resource kinds make good hooks and why Jobs specifically? What is the Sync phase (as opposed to PreSync/PostSync)? How do sync waves and hooks interact? What are hook deletion policies? How do you run a database migration safely before deploying a new version? What is a Skip hook and when is it used? How are hook resources named and prevented from clashing across syncs? How long does ArgoCD wait between sync waves?
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What are the hook phases and when does each run?

Intermediate

Answer

PreSync runs before the main sync (e.g., DB migration). Sync runs alongside the normal resources. PostSync runs after all resources are applied and Healthy (e.g., smoke tests, notifications). SyncFail runs if the sync fails (cleanup/alert). Skip means don't apply the resource. Phases let you inject logic around the deployment.
metadata:
  annotations:
    argocd.argoproj.io/hook: PostSync   # smoke tests after deploy
Real-world example A PostSync hook runs integration smoke tests only after the app is deployed and healthy; a SyncFail hook alerts on failure.

Common follow-ups: When does PostSync run relative to health? | What is the SyncFail phase for?

Applications Sync & Health Sync Waves & Hooks
All 29 Sync Waves & Hooks questions