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What does OutOfSync mean and what should you do about it? What is the Degraded health status? What is a dry-run sync? How does ArgoCD determine the health of a resource? What are sync options and give common examples? What is a selective sync and when is it useful? How do you configure automated sync with retry and backoff? What causes an Application to be perpetually OutOfSync and how do you fix it? How do notifications work for sync and health events? What is the resource hooks vs health relationship during a sync?
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What is the difference between sync status and health status?

Intermediate

Answer

Sync status answers 'does the live cluster match Git?' (Synced/OutOfSync), while health status answers 'are the resources actually working?' (Healthy/Degraded/etc.). An app can be Synced but Degraded (matches Git but pods crash) or Healthy but OutOfSync (working but Git changed). Both are needed for a full picture.
Real-world example A newly merged bad image leaves the app Synced (matches Git) yet Degraded because the pods crash-loop.

Common follow-ups: Can an app be Synced and Degraded? | Which status triggers auto-sync?

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All 29 Sync & Health questions