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What are ignoreDifferences and why are they needed? How does ArgoCD track which resources belong to an Application? What is a Project (AppProject) in ArgoCD? How do you handle resources that ArgoCD should create but not manage/delete? 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? What ApplicationSet generators exist and when do you use each? How do you create ephemeral preview environments with ArgoCD?
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How do you set an Application to auto-create its target namespace?

Intermediate

Answer

Add the CreateNamespace=true sync option so ArgoCD creates the destination namespace if it doesn't exist during sync, avoiding a separate namespace manifest. You can also add managed namespace metadata (labels/annotations) via the syncPolicy in newer versions.
syncPolicy:
  syncOptions:
    - CreateNamespace=true
Real-world example A new app deploys cleanly on first sync because ArgoCD creates its namespace automatically.

Common follow-ups: What if the namespace needs labels? | Does this replace a namespace manifest?

Sync & Health GitOps Principles Applications
All 29 Applications questions