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How do you coordinate hooks across multiple Applications (e.g., App of Apps)? What is a SyncFail hook and how is it used? How do you retry a failed hook Job? How do sync waves handle deletion order during pruning? What are pitfalls of overusing hooks and waves?
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How do you ensure a hook runs on every sync versus only on change?

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Answer

Hooks run each time a sync applies them. To force a hook (like tests) to run every sync even without changes, ensure the resource differs (e.g., generateName or a changing annotation) or trigger a sync explicitly. For run-once semantics, use appropriate delete policies and stable naming.
metadata:
  generateName: smoke-test-
Real-world example Using generateName makes a fresh smoke-test Job on every sync rather than skipping an unchanged one.

Common follow-ups: How do you force a hook to rerun? | What gives run-once behavior?

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