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What are sync waves in ArgoCD? What is the default sync wave and how are negative waves used? What are resource hooks in ArgoCD? Which resource types are commonly used as hooks? 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)? What are the hook phases and when does each run? How do sync waves and hooks interact? What are hook deletion policies?
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How do you annotate a resource with a sync wave?

Beginner

Answer

Add the annotation argocd.argoproj.io/sync-wave with an integer string value on the resource metadata. Lower numbers apply first. Resources without the annotation default to wave 0.
metadata:
  annotations:
    argocd.argoproj.io/sync-wave: "2"
Real-world example The frontend is annotated wave 2 so it deploys after the backend in wave 1.

Common follow-ups: What is the default wave? | Do negative waves run first?

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All 29 Sync Waves & Hooks questions