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What is the difference between sync status and health status? 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? 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? How does ArgoCD assess Deployment health specifically? What is the Suspended health status? How do you skip health assessment or diff for specific fields?
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What causes an Application to be perpetually OutOfSync and how do you fix it?

Intermediate

Answer

Perpetual OutOfSync usually means a field differs every reconcile: mutating webhooks or controllers add/change fields, defaults are injected, or ordering/normalization differs. Fixes include ignoreDifferences for controller-managed fields, correct resource normalization, ServerSideApply, or aligning the manifest with what the API server returns.
spec:
  ignoreDifferences:
    - group: ""
      kind: Service
      jqPathExpressions:
        - .spec.clusterIP
Real-world example A Service showing constant drift is fixed by ignoring the auto-assigned clusterIP field the API server injects.

Common follow-ups: What commonly injects drift-causing fields? | How does ignoreDifferences help?

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All 29 Sync & Health questions