Update dependencies (#5518)

vendor/sigs.k8s.io/apiserver-network-proxy/konnectivity-client/pkg/common/metrics/metrics.go

@@ -0,0 +1,78 @@
+/*
+Copyright 2022 The Kubernetes 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 metrics provides metric definitions and helpers used
+// across konnectivity client, server, and agent.
+package metrics
+
+import (
+	"github.com/prometheus/client_golang/prometheus"
+	"google.golang.org/grpc/status"
+
+	"sigs.k8s.io/apiserver-network-proxy/konnectivity-client/proto/client"
+)
+
+// Segment identifies one of four tunnel segments (e.g. from server to agent).
+type Segment string
+
+const (
+	// SegmentFromClient indicates a packet from client to server.
+	SegmentFromClient Segment = "from_client"
+	// SegmentToClient indicates a packet from server to client.
+	SegmentToClient Segment = "to_client"
+	// SegmentFromAgent indicates a packet from agent to server.
+	SegmentFromAgent Segment = "from_agent"
+	// SegmentToAgent indicates a packet from server to agent.
+	SegmentToAgent Segment = "to_agent"
+)
+
+func MakeStreamPacketsTotalMetric(namespace, subsystem string) *prometheus.CounterVec {
+	return prometheus.NewCounterVec(
+		prometheus.CounterOpts{
+			Namespace: namespace,
+			Subsystem: subsystem,
+			Name:      "stream_packets_total",
+			Help:      "Count of packets processed, by segment and packet type (example: from_client, DIAL_REQ)",
+		},
+		[]string{"segment", "packet_type"},
+	)
+}
+
+func MakeStreamErrorsTotalMetric(namespace, subsystem string) *prometheus.CounterVec {
+	return prometheus.NewCounterVec(
+		prometheus.CounterOpts{
+			Namespace: namespace,
+			Subsystem: subsystem,
+			Name:      "stream_errors_total",
+			Help:      "Count of gRPC stream errors, by segment, grpc Code, packet type. (example: from_agent, Code.Unavailable, DIAL_RSP)",
+		},
+		[]string{"segment", "code", "packet_type"},
+	)
+}
+
+func ObservePacket(m *prometheus.CounterVec, segment Segment, packetType client.PacketType) {
+	m.WithLabelValues(string(segment), packetType.String()).Inc()
+}
+
+func ObserveStreamErrorNoPacket(m *prometheus.CounterVec, segment Segment, err error) {
+	code := status.Code(err)
+	m.WithLabelValues(string(segment), code.String(), "Unknown").Inc()
+}
+
+func ObserveStreamError(m *prometheus.CounterVec, segment Segment, err error, packetType client.PacketType) {
+	code := status.Code(err)
+	m.WithLabelValues(string(segment), code.String(), packetType.String()).Inc()
+}