for _, resource := range response.GetResources() {
			switch resource.GetTypeUrl() {
			case "type.googleapis.com/envoy.service.status.v3.ClientConfig":
				clientConfig := xdsstatus.ClientConfig{}
				err := resource.UnmarshalTo(&clientConfig)
				if err != nil {
					return nil, err
				}
				visited[clientConfig.Node.Id] = true
			default:
				// ignore unknown types.
			}
		}
		return response, nil
	}