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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? What ApplicationSet generators exist and when do you use each? 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? How do you manage shared/common configuration across many Applications?
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ArgoCD › Applications

How do you create ephemeral preview environments with ArgoCD?

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Answer

Use the ApplicationSet Pull Request generator: it creates an Application for each open PR (parameterized by branch/PR number), deploying a preview environment, and deletes it when the PR closes. This gives reviewers a live environment per PR without manual setup, cleaned up automatically.
generators:
  - pullRequest:
      github:
        owner: org
        repo: web
      requeueAfterSeconds: 60
Real-world example Every pull request spins up its own namespace/preview URL via the PR generator, torn down on merge or close.

Common follow-ups: How are preview envs cleaned up? | What parameters can you template from a PR?

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All 29 Applications questions