With net-istio, we require end-users to create ksvcs in a specific way

  annotations:
    serving.knative.openshift.io/enablePassthrough: "true"
spec:
  template:
    metadata:
      annotations:
        sidecar.istio.io/inject: "true"
        sidecar.istio.io/rewriteAppHTTPProbers: "true"

End-users should not have to know if the Serverless is configured with net-istio or courier, so there should be a mechanism that would allow administrators to set up the cluster such that end-users don't have to provide these annotations manually.