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What is the Degraded health status? What is a dry-run sync? How does ArgoCD determine the health of a resource? What is the difference between sync status and health status? 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? What happens during a sync when a resource apply fails?
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What are sync options and give common examples?

Intermediate

Answer

Sync options modify apply behavior, set via the Application or resource annotations. Common ones: Prune=false (don't delete), Validate=false (skip schema validation), CreateNamespace=true (auto-create target namespace), ApplyOutOfSyncOnly=true (only apply changed resources), ServerSideApply=true, and Replace=true (use replace instead of apply).
syncPolicy:
  syncOptions:
    - CreateNamespace=true
    - ApplyOutOfSyncOnly=true
    - ServerSideApply=true
Real-world example CreateNamespace=true lets an app provision its own namespace on first sync without a separate manifest.

Common follow-ups: What does ServerSideApply solve? | When use Replace=true?

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