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More in Sync Waves & Hooks
Which resource types are commonly used as hooks? 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 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? What is a Skip hook and when is it used? How are hook resources named and prevented from clashing across syncs?
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What is the Sync phase (as opposed to PreSync/PostSync)?

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Answer

The Sync phase is the main phase where the application's regular resources are applied. Sync-phase hooks run alongside these resources. PreSync runs before this phase and PostSync after it completes and is Healthy.
Real-world example The Deployment and Service apply during the Sync phase, between the PreSync migration and PostSync tests.

Common follow-ups: What runs in the Sync phase? | How does it relate to Pre/PostSync?

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