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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? How does ArgoCD assess Deployment health specifically? What is the Suspended health status? How do you skip health assessment or diff for specific fields? How does ServerSideApply help with large or conflicting resources? How do you handle CRDs and their custom resources syncing in the right order? How can you customize health checks for third-party or custom resources?
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What happens during a sync when a resource apply fails?

Intermediate

Answer

If applying a resource fails, the sync operation is marked failed; ArgoCD stops progressing further waves and reports the error on the resource. With retry configured it backs off and retries. Already-applied resources remain; you fix the cause (manifest error, RBAC, missing CRD) and re-sync. Hooks may run failure hooks if defined.
Real-world example A sync fails because a manifest references a missing CRD; ArgoCD reports the error, and after installing the CRD the re-sync succeeds.

Common follow-ups: Does a failed sync roll back applied resources? | What is a SyncFail hook?

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