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What are the risks of App of Apps and how do you mitigate them? How do you combine App of Apps with ApplicationSets? How do you manage environment promotion using App of Apps? How do you prevent accidental deletion of all child apps? How do you use sync waves on child applications for ordered platform bootstrap? How do you handle per-environment differences in an App of Apps model? What are alternatives to App of Apps for managing many apps? How does App of Apps support multi-cluster bootstrapping? How do you version and roll back the whole app set?
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When should you migrate from App of Apps to ApplicationSets?

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Answer

Migrate when you're hand-maintaining many near-identical child manifests, deploying to many clusters, or need dynamic generation (per-PR, per-directory). ApplicationSets template these automatically. Keep App of Apps for a small, static, curated set where explicit manifests are clearer.
Real-world example Growing from 5 to 50 clusters, the team replaces per-cluster child manifests with a cluster-generator ApplicationSet.

Common follow-ups: What signals it's time for ApplicationSets? | When is App of Apps still fine?

Applications Multi-cluster App of Apps
All 28 App of Apps questions