rebase: update kubernetes to 1.28.0 in main

updating kubernetes to 1.28.0
in the main repo.

Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>

vendor/k8s.io/apiserver/pkg/util/peerproxy/metrics/metrics.go

@@ -0,0 +1,56 @@
+/*
+Copyright 2023 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
+
+import (
+	"context"
+	"sync"
+
+	"k8s.io/component-base/metrics"
+	"k8s.io/component-base/metrics/legacyregistry"
+)
+
+const (
+	subsystem  = "apiserver"
+	statuscode = "code"
+)
+
+var registerMetricsOnce sync.Once
+
+var (
+	// peerProxiedRequestsTotal counts the number of requests that were proxied to a peer kube-apiserver.
+	peerProxiedRequestsTotal = metrics.NewCounterVec(
+		&metrics.CounterOpts{
+			Subsystem:      subsystem,
+			Name:           "rerouted_request_total",
+			Help:           "Total number of requests that were proxied to a peer kube apiserver because the local apiserver was not capable of serving it",
+			StabilityLevel: metrics.ALPHA,
+		},
+		[]string{statuscode},
+	)
+)
+
+func Register() {
+	registerMetricsOnce.Do(func() {
+		legacyregistry.MustRegister(peerProxiedRequestsTotal)
+	})
+}
+
+// IncPeerProxiedRequest increments the # of proxied requests to peer kube-apiserver
+func IncPeerProxiedRequest(ctx context.Context, status string) {
+	peerProxiedRequestsTotal.WithContext(ctx).WithLabelValues(status).Add(1)
+}