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What namespace do ArgoCD Application resources live in? What is the targetRevision HEAD and when should you avoid it? How do you deploy a Helm chart with ArgoCD and override values? How do you use Kustomize with an ArgoCD Application? What does the prune option do in a sync policy? What is selfHeal and when should you use it? How do you pin an Application to a specific Git revision or tag? 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?
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What is the difference between manual and automated sync policy?

Intermediate

Answer

With manual sync, ArgoCD detects differences and marks the app OutOfSync but waits for a user (or API/CI) to trigger the sync. With automated sync, ArgoCD applies changes automatically when Git changes or drift is detected. Automated can add prune and selfHeal for full continuous reconciliation.
syncPolicy:
  automated:
    prune: true
    selfHeal: true
Real-world example Dev uses automated sync for fast iteration, while production uses manual sync so a human approves each promotion.

Common follow-ups: What do prune and selfHeal add? | Why might production use manual sync?

Sync & Health GitOps Principles Applications
All 29 Applications questions