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How do you set an Application to auto-create its target namespace? 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 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? What are multiple sources in an Application and why use them? How do you troubleshoot an Application stuck in Progressing or OutOfSync? What is a config management plugin (CMP) and when do you need one?
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What are ApplicationSets and what problem do they solve?

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Answer

ApplicationSet is a controller that templates and generates many Applications from a single spec using generators (list, cluster, Git directory/file, matrix, pull request, SCM). It removes the toil of hand-writing an Application per environment/cluster/team and keeps a fleet of apps consistent and automatically updated as inputs change.
apiVersion: argoproj.io/v1alpha1
kind: ApplicationSet
spec:
  generators:
    - clusters: {}
  template:
    metadata: { name: '{{name}}-guestbook' }
    spec:
      destination:
        server: '{{server}}'
        namespace: guestbook
Real-world example One ApplicationSet with a cluster generator deploys the same app to all 20 registered clusters automatically.

Common follow-ups: What generators are available? | How does ApplicationSet differ from App of Apps?

Multi-cluster App of Apps Applications
All 29 Applications questions