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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? How do you manage many environments (dev/staging/prod) for one app? How do you troubleshoot an Application stuck in Progressing or OutOfSync? What is a config management plugin (CMP) and when do you need one? How do you handle large Applications that hit apply size or performance limits? How do you manage shared/common configuration across many Applications?
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ArgoCD › Applications

What are multiple sources in an Application and why use them?

Advanced

Answer

Newer ArgoCD supports multiple sources in one Application, letting you combine, for example, a Helm chart from one repo with values from another repo, or reference resources across repos. This decouples chart source from environment config and supports patterns like using a shared chart with team-owned values.
spec:
  sources:
    - repoURL: https://charts.example.com
      chart: app
      targetRevision: 1.2.0
      helm:
        valueFiles: ['$values/prod.yaml']
    - repoURL: https://github.com/org/config
      targetRevision: main
      ref: values
Real-world example The app renders a public Helm chart but pulls its production values from a separate, access-controlled config repo.

Common follow-ups: How do you reference values from another repo? | When are multiple sources useful?

GitOps Principles Multi-cluster Applications
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