TypeUrl:       request.TypeUrl,
		ResponseNonce: request.ResponseNonce,
		ErrorDetail:   request.ErrorDetail,
	}
}

// deltaWatchedResources returns current watched resources of delta xds
func deltaWatchedResources(existing []string, request *discovery.DeltaDiscoveryRequest) ([]string, bool) {
	res := sets.New(existing...)
	res.InsertAll(request.ResourceNamesSubscribe...)