argocd-example-apps/app-of-apps-kustomize/base/kustomize-guestbook.yaml

apiVersion: argoproj.io/v1alpha1
kind: Application
metadata:
  name: kustomize-guestbook
  namespace: argocd
  finalizers:
  - resources-finalizer.argocd.argoproj.io
spec:
  destination:
    namespace: kustomize-guestbook
    server: $(SERVER)
  project: $(PROJECT)
  source:
    path: kustomize-guestbook
    repoURL: $(REPO_URL)
    targetRevision: $(TARGET_REVISION)