add ingress class metrics

docs/README.md

@@ -65,6 +65,7 @@ See each file for specific documentation about the exposed metrics:
 
 - [ClusterRole Metrics](clusterrole-metrics.md)
 - [ClusterRoleBinding Metrics](clusterrolebinding-metrics.md)
+- [IngressClass Metrics](ingressclass-metrics.md)
 - [Role Metrics](role-metrics.md)
 - [RoleBinding Metrics](rolebinding-metrics.md)
 - [ServiceAccount Metrics](serviceaccount-metrics.md)

docs/ingressclass-metrics.md

@@ -0,0 +1,8 @@
+# IngressClass Metrics
+
+| Metric name| Metric type | Labels/tags | Status |
+| ---------- | ----------- | ----------- | ----------- |
+| kube_ingressclass_annotations | Gauge | `ingressclass`=&lt;ingressclass-name&gt; <br> `annotation_INGRESSCLASS_ANNOTATION`=&lt;INGRESSCLASS_ANNOTATION&gt; | EXPERIMENTAL |
+| kube_ingressclass_info | Gauge | `ingressclass`=&lt;ingressclass-name&gt; <br> `controller`=&lt;ingress-controller-name&gt; <br> | STABLE |
+| kube_ingressclass_labels | Gauge | `ingressclass`=&lt;ingressclass-name&gt; <br> `label_INGRESSCLASS_LABEL`=&lt;INGRESSCLASS_LABEL&gt; | STABLE |
+| kube_ingressclass_created  | Gauge | `ingressclass`=&lt;ingressclass-name&gt; | STABLE |

examples/autosharding/cluster-role.yaml

@@ -97,6 +97,7 @@ rules:
   - networking.k8s.io
   resources:
   - networkpolicies
+  - ingressclasses
   - ingresses
   verbs:
   - list

examples/standard/cluster-role.yaml

@@ -97,6 +97,7 @@ rules:
   - networking.k8s.io
   resources:
   - networkpolicies
+  - ingressclasses
   - ingresses
   verbs:
   - list

internal/store/builder.go

@@ -295,6 +295,7 @@ var availableStores = map[string]func(f *Builder) []cache.Store{
 	"endpoints":                       func(b *Builder) []cache.Store { return b.buildEndpointsStores() },
 	"horizontalpodautoscalers":        func(b *Builder) []cache.Store { return b.buildHPAStores() },
 	"ingresses":                       func(b *Builder) []cache.Store { return b.buildIngressStores() },
+	"ingressclasses":                  func(b *Builder) []cache.Store { return b.buildIngressClassStores() },
 	"jobs":                            func(b *Builder) []cache.Store { return b.buildJobStores() },
 	"leases":                          func(b *Builder) []cache.Store { return b.buildLeasesStores() },
 	"limitranges":                     func(b *Builder) []cache.Store { return b.buildLimitRangeStores() },
@@ -470,6 +471,10 @@ func (b *Builder) buildRoleBindingStores() []cache.Store {
 	return b.buildStoresFunc(roleBindingMetricFamilies(b.allowAnnotationsList["rolebindings"], b.allowLabelsList["rolebindings"]), &rbacv1.RoleBinding{}, createRoleBindingListWatch, b.useAPIServerCache)
 }
 
+func (b *Builder) buildIngressClassStores() []cache.Store {
+	return b.buildStoresFunc(ingressClassMetricFamilies(b.allowAnnotationsList["ingressclass"], b.allowLabelsList["ingressclass"]), &networkingv1.IngressClass{}, createIngressClassListWatch, b.useAPIServerCache)
+}
+
 func (b *Builder) buildStores(
 	metricFamilies []generator.FamilyGenerator,
 	expectedType interface{},

internal/store/ingressclass.go

@@ -0,0 +1,134 @@
+/*
+Copyright 2022 The Kubernetes Authors All rights reserved.
+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 store
+
+import (
+	"context"
+
+	"k8s.io/kube-state-metrics/v2/pkg/metric"
+	generator "k8s.io/kube-state-metrics/v2/pkg/metric_generator"
+
+	networkingv1 "k8s.io/api/networking/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/apimachinery/pkg/watch"
+	clientset "k8s.io/client-go/kubernetes"
+	"k8s.io/client-go/tools/cache"
+)
+
+var (
+	descIngressClassAnnotationsName     = "kube_ingressclass_annotations"
+	descIngressClassAnnotationsHelp     = "Kubernetes annotations converted to Prometheus labels."
+	descIngressClassLabelsName          = "kube_ingressclass_labels"
+	descIngressClassLabelsHelp          = "Kubernetes labels converted to Prometheus labels."
+	descIngressClassLabelsDefaultLabels = []string{"ingressclass"}
+)
+
+func ingressClassMetricFamilies(allowAnnotationsList, allowLabelsList []string) []generator.FamilyGenerator {
+	return []generator.FamilyGenerator{
+		*generator.NewFamilyGenerator(
+			"kube_ingressclass_info",
+			"Information about ingressclass.",
+			metric.Gauge,
+			"",
+			wrapIngressClassFunc(func(s *networkingv1.IngressClass) *metric.Family {
+
+				m := metric.Metric{
+					LabelKeys:   []string{"controller"},
+					LabelValues: []string{s.Spec.Controller},
+					Value:       1,
+				}
+				return &metric.Family{Metrics: []*metric.Metric{&m}}
+			}),
+		),
+		*generator.NewFamilyGenerator(
+			"kube_ingressclass_created",
+			"Unix creation timestamp",
+			metric.Gauge,
+			"",
+			wrapIngressClassFunc(func(s *networkingv1.IngressClass) *metric.Family {
+				ms := []*metric.Metric{}
+				if !s.CreationTimestamp.IsZero() {
+					ms = append(ms, &metric.Metric{
+						Value: float64(s.CreationTimestamp.Unix()),
+					})
+				}
+				return &metric.Family{
+					Metrics: ms,
+				}
+			}),
+		),
+		*generator.NewFamilyGenerator(
+			descIngressClassAnnotationsName,
+			descIngressClassAnnotationsHelp,
+			metric.Gauge,
+			"",
+			wrapIngressClassFunc(func(s *networkingv1.IngressClass) *metric.Family {
+				annotationKeys, annotationValues := createPrometheusLabelKeysValues("annotation", s.Annotations, allowAnnotationsList)
+				return &metric.Family{
+					Metrics: []*metric.Metric{
+						{
+							LabelKeys:   annotationKeys,
+							LabelValues: annotationValues,
+							Value:       1,
+						},
+					},
+				}
+			}),
+		),
+		*generator.NewFamilyGenerator(
+			descIngressClassLabelsName,
+			descIngressClassLabelsHelp,
+			metric.Gauge,
+			"",
+			wrapIngressClassFunc(func(s *networkingv1.IngressClass) *metric.Family {
+				labelKeys, labelValues := createPrometheusLabelKeysValues("label", s.Labels, allowLabelsList)
+				return &metric.Family{
+					Metrics: []*metric.Metric{
+						{
+							LabelKeys:   labelKeys,
+							LabelValues: labelValues,
+							Value:       1,
+						},
+					},
+				}
+			}),
+		),
+	}
+}
+
+func wrapIngressClassFunc(f func(*networkingv1.IngressClass) *metric.Family) func(interface{}) *metric.Family {
+	return func(obj interface{}) *metric.Family {
+		ingressClass := obj.(*networkingv1.IngressClass)
+
+		metricFamily := f(ingressClass)
+
+		for _, m := range metricFamily.Metrics {
+			m.LabelKeys, m.LabelValues = mergeKeyValues(descIngressClassLabelsDefaultLabels, []string{ingressClass.Name}, m.LabelKeys, m.LabelValues)
+		}
+
+		return metricFamily
+	}
+}
+
+func createIngressClassListWatch(kubeClient clientset.Interface, ns string, fieldSelector string) cache.ListerWatcher {
+	return &cache.ListWatch{
+		ListFunc: func(opts metav1.ListOptions) (runtime.Object, error) {
+			return kubeClient.NetworkingV1().IngressClasses().List(context.TODO(), opts)
+		},
+		WatchFunc: func(opts metav1.ListOptions) (watch.Interface, error) {
+			return kubeClient.NetworkingV1().IngressClasses().Watch(context.TODO(), opts)
+		},
+	}
+}

internal/store/ingressclass_test.go

@@ -0,0 +1,105 @@
+/*
+Copyright 2022 The Kubernetes Authors All rights reserved.
+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 store
+
+import (
+	"testing"
+
+	networkingv1 "k8s.io/api/networking/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+
+	generator "k8s.io/kube-state-metrics/v2/pkg/metric_generator"
+)
+
+func TestIngressClassStore(t *testing.T) {
+	startTime := 1501569018
+	metav1StartTime := metav1.Unix(int64(startTime), 0)
+
+	cases := []generateMetricsTestCase{
+		{
+			Obj: &networkingv1.IngressClass{
+				ObjectMeta: metav1.ObjectMeta{
+					Name: "test_ingressclass-info",
+				},
+				Spec: networkingv1.IngressClassSpec{
+					Controller: "controller",
+				},
+			},
+			Want: `
+					# HELP kube_ingressclass_info Information about ingressclass.
+					# TYPE kube_ingressclass_info gauge
+					kube_ingressclass_info{ingressclass="test_ingressclass-info",controller="controller"} 1
+				`,
+			MetricNames: []string{
+				"kube_ingressclass_info",
+			},
+		},
+		{
+			Obj: &networkingv1.IngressClass{
+				ObjectMeta: metav1.ObjectMeta{
+					Name:              "test_kube_ingressclass-created",
+					CreationTimestamp: metav1StartTime,
+				},
+				Spec: networkingv1.IngressClassSpec{
+					Controller: "controller",
+				},
+			},
+			Want: `
+					# HELP kube_ingressclass_created Unix creation timestamp
+					# TYPE kube_ingressclass_created gauge
+					kube_ingressclass_created{ingressclass="test_kube_ingressclass-created"} 1.501569018e+09
+				`,
+			MetricNames: []string{
+				"kube_ingressclass_created",
+			},
+		},
+		{
+			AllowAnnotationsList: []string{
+				"ingressclass.kubernetes.io/is-default-class",
+			},
+			Obj: &networkingv1.IngressClass{
+				ObjectMeta: metav1.ObjectMeta{
+					Name: "test_ingressclass-labels",
+					Annotations: map[string]string{
+						"ingressclass.kubernetes.io/is-default-class": "true",
+					},
+					Labels: map[string]string{
+						"foo": "bar",
+					},
+				},
+				Spec: networkingv1.IngressClassSpec{
+					Controller: "controller",
+				},
+			},
+			Want: `
+					# HELP kube_ingressclass_annotations Kubernetes annotations converted to Prometheus labels.
+					# HELP kube_ingressclass_labels Kubernetes labels converted to Prometheus labels.
+					# TYPE kube_ingressclass_annotations gauge
+					# TYPE kube_ingressclass_labels gauge
+					kube_ingressclass_annotations{ingressclass="test_ingressclass-labels",annotation_ingressclass_kubernetes_io_is_default_class="true"} 1
+					kube_ingressclass_labels{ingressclass="test_ingressclass-labels"} 1
+				`,
+			MetricNames: []string{
+				"kube_ingressclass_annotations", "kube_ingressclass_labels",
+			},
+		},
+	}
+	for i, c := range cases {
+		c.Func = generator.ComposeMetricGenFuncs(ingressClassMetricFamilies(c.AllowAnnotationsList, nil))
+		c.Headers = generator.ExtractMetricFamilyHeaders(ingressClassMetricFamilies(c.AllowAnnotationsList, nil))
+		if err := c.run(); err != nil {
+			t.Errorf("unexpected collecting result in %vth run:\n%s", i, err)
+		}
+	}
+}

jsonnet/kube-state-metrics/kube-state-metrics.libsonnet

@@ -134,6 +134,7 @@
         apiGroups: ['networking.k8s.io'],
         resources: [
           'networkpolicies',
+          'ingressclasses',
           'ingresses',
         ],
         verbs: ['list', 'watch'],

tests/manifests/ingress.yaml

@@ -1,4 +1,4 @@
-apiVersion: networking.k8s.io/v1 
+apiVersion: networking.k8s.io/v1
 kind: Ingress
 metadata:
   name: example-ingress

tests/manifests/ingressclass.yaml

@@ -0,0 +1,8 @@
+apiVersion: networking.k8s.io/v1
+kind: IngressClass
+metadata:
+  name: example-ingressclass
+  annotations:
+    ingressclass.kubernetes.io/is-default-class: "true"
+spec:
+  controller: example-ingress/controller