// Combine all the shards as one, even if that means losing information about
		// the control plane version from each shard.
		retval.ControlPlane = response.ControlPlane
		retval.Resources = append(retval.Resources, response.Resources...)
	}

	return &retval, nil
}

func makeSan(istioNamespace, revision string) string {
	if revision == "" {
		return fmt.Sprintf("istiod.%s.svc", istioNamespace)
	}