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What is a config management plugin (CMP) and when do you need one?

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Answer

A CMP extends ArgoCD to render manifests with tools it doesn't natively support (e.g., cdk8s, jsonnet bundler, custom templating). You define the plugin in the repo-server (sidecar) and reference it in the Application. Use it when your manifests are generated by a tool outside Helm/Kustomize/Jsonnet.
source:
  plugin:
    name: my-cmp
Real-world example A team generating manifests with cdk8s wires a CMP so ArgoCD can render and sync that output.

Common follow-ups: How is a CMP deployed? | When is a CMP unnecessary?

GitOps Principles Sync & Health Applications
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