build: move e2e dependencies into e2e/go.mod

Several packages are only used while running the e2e suite. These
packages are less important to update, as the they can not influence the
final executable that is part of the Ceph-CSI container-image.

By moving these dependencies out of the main Ceph-CSI go.mod, it is
easier to identify if a reported CVE affects Ceph-CSI, or only the
testing (like most of the Kubernetes CVEs).

Signed-off-by: Niels de Vos <ndevos@ibm.com>

e2e/vendor/k8s.io/component-base/metrics/prometheus/slis/metrics.go

@@ -0,0 +1,75 @@
+/*
+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 slis
+
+import (
+	"context"
+	k8smetrics "k8s.io/component-base/metrics"
+)
+
+type HealthcheckStatus string
+
+const (
+	Success HealthcheckStatus = "success"
+	Error   HealthcheckStatus = "error"
+)
+
+var (
+	// healthcheck is a Prometheus Gauge metrics used for recording the results of a k8s healthcheck.
+	healthcheck = k8smetrics.NewGaugeVec(
+		&k8smetrics.GaugeOpts{
+			Namespace:      "kubernetes",
+			Name:           "healthcheck",
+			Help:           "This metric records the result of a single healthcheck.",
+			StabilityLevel: k8smetrics.STABLE,
+		},
+		[]string{"name", "type"},
+	)
+
+	// healthchecksTotal is a Prometheus Counter metrics used for counting the results of a k8s healthcheck.
+	healthchecksTotal = k8smetrics.NewCounterVec(
+		&k8smetrics.CounterOpts{
+			Namespace:      "kubernetes",
+			Name:           "healthchecks_total",
+			Help:           "This metric records the results of all healthcheck.",
+			StabilityLevel: k8smetrics.STABLE,
+		},
+		[]string{"name", "type", "status"},
+	)
+)
+
+func Register(registry k8smetrics.KubeRegistry) {
+	registry.Register(healthcheck)
+	registry.Register(healthchecksTotal)
+	_ = k8smetrics.RegisterProcessStartTime(registry.Register)
+}
+
+func ResetHealthMetrics() {
+	healthcheck.Reset()
+	healthchecksTotal.Reset()
+}
+
+func ObserveHealthcheck(ctx context.Context, name string, healthcheckType string, status HealthcheckStatus) error {
+	if status == Success {
+		healthcheck.WithContext(ctx).WithLabelValues(name, healthcheckType).Set(1)
+	} else {
+		healthcheck.WithContext(ctx).WithLabelValues(name, healthcheckType).Set(0)
+	}
+
+	healthchecksTotal.WithContext(ctx).WithLabelValues(name, healthcheckType, string(status)).Inc()
+	return nil
+}

e2e/vendor/k8s.io/component-base/metrics/prometheus/slis/registry.go

@@ -0,0 +1,27 @@
+/*
+Copyright 2020 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 slis
+
+import (
+	"k8s.io/component-base/metrics"
+)
+
+var (
+	// Registry exposes the SLI registry so that additional SLIs can be
+	// added on a per-component basis.
+	Registry = metrics.NewKubeRegistry()
+)

e2e/vendor/k8s.io/component-base/metrics/prometheus/slis/routes.go

@@ -0,0 +1,53 @@
+/*
+Copyright 2020 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 slis
+
+import (
+	"net/http"
+	"sync"
+
+	"k8s.io/component-base/metrics"
+)
+
+var (
+	installOnce          = sync.Once{}
+	installWithResetOnce = sync.Once{}
+)
+
+type mux interface {
+	Handle(path string, handler http.Handler)
+}
+
+type SLIMetrics struct{}
+
+// Install adds the DefaultMetrics handler
+func (s SLIMetrics) Install(m mux) {
+	installOnce.Do(func() {
+		Register(Registry)
+	})
+	m.Handle("/metrics/slis", metrics.HandlerFor(Registry, metrics.HandlerOpts{}))
+}
+
+type SLIMetricsWithReset struct{}
+
+// Install adds the DefaultMetrics handler
+func (s SLIMetricsWithReset) Install(m mux) {
+	installWithResetOnce.Do(func() {
+		Register(Registry)
+	})
+	m.Handle("/metrics/slis", metrics.HandlerWithReset(Registry, metrics.HandlerOpts{}))
+}