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What ApplicationSet generators exist and when do you use each? How do you create ephemeral preview environments with ArgoCD? How do you manage many environments (dev/staging/prod) for one app? What are multiple sources in an Application and why use them? What is a config management plugin (CMP) and when do you need one? How do you handle large Applications that hit apply size or performance limits? How do you manage shared/common configuration across many Applications?
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How do you troubleshoot an Application stuck in Progressing or OutOfSync?

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Answer

Check `argocd app get` for resource-level status and messages, view the diff to see what's out of sync, inspect events and pod/controller logs, verify health checks (custom resources may need Lua health scripts), and confirm no sync hooks or waves are blocking. Common causes: failing readiness probes, missing CRDs, RBAC denials, or resources mutated outside Git.
argocd app get my-app --refresh
argocd app resources my-app
kubectl describe <resource>   # events/conditions
Real-world example An app stuck Progressing is traced to a failing readiness probe; fixing the health check clears it to Healthy.

Common follow-ups: Why might a custom resource never report Healthy? | What blocks a sync from completing?

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