// Rewrite rules for etcd metrics that are exported by default.
		exported: map[string]*exportedMetric{
			// etcd 3.0 metric format for total grpc requests with renamed method and service labels.
			"etcd_grpc_requests_total": {
				rewriters: []rewriteFunc{
					func(mf *dto.MetricFamily) (*dto.MetricFamily, error) {
						mf = deepCopyMetricFamily(mf)
						renameLabels(mf, map[string]string{
							"grpc_method":  "method",