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How do Application parameters differ between Helm and Kustomize sources? How do you temporarily pause management of an Application? How do you view an Application's sync history and roll back to a prior revision? What are ApplicationSets and what problem do they solve? 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? How do you troubleshoot an Application stuck in Progressing or OutOfSync? 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?
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What ApplicationSet generators exist and when do you use each?

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Answer

Generators include: List (static values), Cluster (per registered cluster), Git (per directory or from a config file in Git), Matrix (combine two generators), Merge (overlay generators), SCM Provider (per repo in an org), and Pull Request (per open PR, great for preview environments). You pick based on whether apps vary by cluster, directory, repo, or PR.
generators:
  - matrix:
      generators:
        - clusters: {}
        - git:
            directories: [{ path: apps/* }]
Real-world example A matrix generator crosses every cluster with every app directory to deploy all apps to all clusters from one ApplicationSet.

Common follow-ups: What is the Pull Request generator used for? | How does the Matrix generator combine inputs?

Multi-cluster App of Apps Applications
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