app-template-python/k8s/prod/mcs.yaml

apiVersion: networking.gke.io/v1
kind: MultiClusterService
metadata:
  name: mcs
  namespace: YOUR_APPLICATION
  annotations:
    configmanagement.gke.io/cluster-selector: "config"
spec:
  template:
    spec:
      selector:
        app: YOUR_APPLICATION-app
      ports:
      - name: http
        protocol: TCP
        port: 8080
        targetPort: 8080