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What is a sync in ArgoCD? What are the possible sync statuses of an Application? What are the health statuses ArgoCD reports? How do you force a refresh or hard refresh of an Application? 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 is the difference between sync status and health status? What are sync options and give common examples?
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What does the diff view show and how do you use it?

Beginner

Answer

The diff view shows the differences between the desired state (Git) and the live state for each out-of-sync resource, highlighting added, removed, or changed fields. It's used to review exactly what a sync will change before applying, and to diagnose why an app is OutOfSync.
argocd app diff my-app
Real-world example Before approving a production sync, the reviewer inspects the diff to confirm only the intended image tag changed.

Common follow-ups: Why review the diff before sync? | Where do you see the diff?

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All 29 Sync & Health questions