[VOL-2235] Mocks and interfaces for rw-core

This update consists of mocks that are used by the rw-core
during unit testing.  It also includes interfaces used for unit
tests.

Change-Id: I20ca1455c358113c3aa897acc6355e0ddbc614b7
diff --git a/vendor/go.etcd.io/etcd/etcdserver/api/v3rpc/metrics.go b/vendor/go.etcd.io/etcd/etcdserver/api/v3rpc/metrics.go
new file mode 100644
index 0000000..d633d27
--- /dev/null
+++ b/vendor/go.etcd.io/etcd/etcdserver/api/v3rpc/metrics.go
@@ -0,0 +1,48 @@
+// Copyright 2016 The etcd Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package v3rpc
+
+import "github.com/prometheus/client_golang/prometheus"
+
+var (
+	sentBytes = prometheus.NewCounter(prometheus.CounterOpts{
+		Namespace: "etcd",
+		Subsystem: "network",
+		Name:      "client_grpc_sent_bytes_total",
+		Help:      "The total number of bytes sent to grpc clients.",
+	})
+
+	receivedBytes = prometheus.NewCounter(prometheus.CounterOpts{
+		Namespace: "etcd",
+		Subsystem: "network",
+		Name:      "client_grpc_received_bytes_total",
+		Help:      "The total number of bytes received from grpc clients.",
+	})
+
+	streamFailures = prometheus.NewCounterVec(prometheus.CounterOpts{
+		Namespace: "etcd",
+		Subsystem: "network",
+		Name:      "server_stream_failures_total",
+		Help:      "The total number of stream failures from the local server.",
+	},
+		[]string{"Type", "API"},
+	)
+)
+
+func init() {
+	prometheus.MustRegister(sentBytes)
+	prometheus.MustRegister(receivedBytes)
+	prometheus.MustRegister(streamFailures)
+}