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How do you deploy a Helm chart with ArgoCD and override values? How do you use Kustomize with an ArgoCD Application? What is the difference between manual and automated sync policy? What does the prune option do in a sync policy? 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? How do you handle resources that ArgoCD should create but not manage/delete? How do you set an Application to auto-create its target namespace?
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What is selfHeal and when should you use it?

Intermediate

Answer

selfHeal makes ArgoCD automatically revert live changes that deviate from Git, even if the change wasn't via Git (e.g., a manual kubectl edit). It enforces Git as the source of truth and prevents drift, but can fight tools that legitimately mutate resources, so it's used where Git should fully own the state.
syncPolicy:
  automated:
    selfHeal: true
Real-world example A manual replica change is reverted within a reconciliation cycle because selfHeal restores the Git-defined value.

Common follow-ups: When can selfHeal cause conflicts? | How does it relate to drift?

GitOps Principles Sync & Health Applications
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