In etcd-version-monitor, Remove grpc labels used only in etcd 3 format when translating metric back to 3.0 format

cluster/images/etcd-version-monitor/BUILD

@@ -17,6 +17,7 @@ go_library(
     srcs = ["etcd-version-monitor.go"],
     importpath = "k8s.io/kubernetes/cluster/images/etcd-version-monitor",
     deps = [
+        "//vendor/github.com/gogo/protobuf/proto:go_default_library",
         "//vendor/github.com/golang/glog:go_default_library",
         "//vendor/github.com/prometheus/client_golang/prometheus:go_default_library",
         "//vendor/github.com/prometheus/client_golang/prometheus/promhttp:go_default_library",

cluster/images/etcd-version-monitor/Makefile

@@ -20,7 +20,7 @@
 ARCH:=amd64
 GOLANG_VERSION?=1.8.3
 REGISTRY?=staging-k8s.gcr.io
-TAG?=0.1.1
+TAG?=0.1.2
 IMAGE:=$(REGISTRY)/etcd-version-monitor:$(TAG)
 CURRENT_DIR:=$(pwd)
 TEMP_DIR:=$(shell mktemp -d)

cluster/images/etcd-version-monitor/etcd-version-monitor.go

@@ -17,12 +17,14 @@ limitations under the License.
 package main
 
 import (
+	"bytes"
 	"encoding/json"
 	goflag "flag"
 	"fmt"
 	"net/http"
 	"time"
 
+	"github.com/gogo/protobuf/proto"
 	"github.com/golang/glog"
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/promhttp"
@@ -97,6 +99,13 @@ var (
 							"grpc_method":  "method",
 							"grpc_service": "service",
 						})
+						filterMetricsByLabels(mf, map[string]string{
+							"grpc_type": "unary",
+						})
+						groupCounterMetricsByLabels(mf, map[string]bool{
+							"grpc_type": true,
+							"grpc_code": true,
+						})
 						return mf, nil
 					},
 				},
@@ -280,6 +289,62 @@ func renameLabels(mf *dto.MetricFamily, nameMapping map[string]string) {
 	}
 }
 
+func filterMetricsByLabels(mf *dto.MetricFamily, labelValues map[string]string) {
+	buf := mf.Metric[:0]
+	for _, m := range mf.Metric {
+		shouldRemove := false
+		for _, lbl := range m.Label {
+			if val, ok := labelValues[*lbl.Name]; ok && val != *lbl.Value {
+				shouldRemove = true
+				break
+			}
+		}
+		if !shouldRemove {
+			buf = append(buf, m)
+		}
+	}
+	mf.Metric = buf
+}
+
+func groupCounterMetricsByLabels(mf *dto.MetricFamily, names map[string]bool) {
+	buf := mf.Metric[:0]
+	deleteLabels(mf, names)
+	byLabels := map[string]*dto.Metric{}
+	for _, m := range mf.Metric {
+		if metric, ok := byLabels[labelsKey(m.Label)]; ok {
+			metric.Counter.Value = proto.Float64(*metric.Counter.Value + *m.Counter.Value)
+		} else {
+			byLabels[labelsKey(m.Label)] = m
+			buf = append(buf, m)
+		}
+	}
+	mf.Metric = buf
+}
+
+func labelsKey(lbls []*dto.LabelPair) string {
+	var buf bytes.Buffer
+	for i, lbl := range lbls {
+		buf.WriteString(lbl.String())
+		if i < len(lbls)-1 {
+			buf.WriteString(",")
+		}
+	}
+	return buf.String()
+}
+
+func deleteLabels(mf *dto.MetricFamily, names map[string]bool) {
+	for _, m := range mf.Metric {
+		buf := m.Label[:0]
+		for _, lbl := range m.Label {
+			shouldRemove := names[*lbl.Name]
+			if !shouldRemove {
+				buf = append(buf, lbl)
+			}
+		}
+		m.Label = buf
+	}
+}
+
 func identity(mf *dto.MetricFamily) (*dto.MetricFamily, error) {
 	return mf, nil
 }

cluster/images/etcd-version-monitor/etcd-version-monitor.yaml

@@ -7,7 +7,7 @@ spec:
   hostNetwork: true
   containers:
   - name: etcd-version-monitor
-    image: k8s.gcr.io/etcd-version-monitor:0.1.0
+    image: k8s.gcr.io/etcd-version-monitor:0.1.2
     command:
     - /etcd-version-monitor
     - --logtostderr