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What are the hook phases and when does each run? 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? 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? Can hooks use sync waves to order among themselves? How do you notify an external system after a successful deployment using hooks?
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What is a Skip hook and when is it used?

Intermediate

Answer

A resource annotated with hook Skip is not applied by ArgoCD during sync—useful to keep a manifest in the repo for reference or manual application without ArgoCD managing it. It effectively excludes the resource from the sync while keeping it version-controlled.
metadata:
  annotations:
    argocd.argoproj.io/hook: Skip
Real-world example A sample/manual resource is kept in Git for documentation but marked Skip so ArgoCD never applies it.

Common follow-ups: How does Skip differ from Prune=false? | Why keep a skipped resource in Git?

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All 29 Sync Waves & Hooks questions