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What resource kinds make good hooks and why Jobs specifically? What is the Sync phase (as opposed to PreSync/PostSync)? What are the hook phases and when does each run? How do sync waves and hooks interact? 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? What is a PreSync hook typically used for? What is a PostSync hook typically used for?
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ArgoCD › Sync Waves & Hooks

What are hook deletion policies?

Intermediate

Answer

Hook deletion policies control when hook resources (like Jobs) are cleaned up: HookSucceeded (delete after success), HookFailed (delete after failure), or BeforeHookCreation (delete the previous hook instance before creating a new one). They prevent accumulation of completed Job objects and manage reruns.
metadata:
  annotations:
    argocd.argoproj.io/hook: PreSync
    argocd.argoproj.io/hook-delete-policy: HookSucceeded
Real-world example A migration Job is deleted automatically after it succeeds so old completed Jobs don't pile up in the namespace.

Common follow-ups: Why use BeforeHookCreation? | What happens without a delete policy?

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All 29 Sync Waves & Hooks questions