Add kube_pod_status_qos_class gauge to pod metrics

docs/pod-metrics.md

@@ -11,6 +11,7 @@
 | kube_pod_labels | Gauge | Kubernetes labels converted to Prometheus labels                      | | `pod`=&lt;pod-name&gt; <br> `namespace`=&lt;pod-namespace&gt; <br> `label_POD_LABEL`=&lt;POD_LABEL&gt; <br> `uid`=&lt;pod-uid&gt; | STABLE | - |
 | kube_pod_nodeselectors| Gauge | Describes the Pod nodeSelectors                                       | |  `pod`=&lt;pod-name&gt; <br> `namespace`=&lt;pod-namespace&gt; <br> `nodeselector_NODE_SELECTOR`=&lt;NODE_SELECTOR&gt; <br> `uid`=&lt;pod-uid&gt; | EXPERIMENTAL | Opt-in |
 | kube_pod_status_phase | Gauge | The pods current phase                                                | | `pod`=&lt;pod-name&gt; <br> `namespace`=&lt;pod-namespace&gt; <br> `phase`=&lt;Pending\|Running\|Succeeded\|Failed\|Unknown&gt; <br> `uid`=&lt;pod-uid&gt; | STABLE | - |
+| kube_pod_status_qos_class | Gauge | The pods current qosClass                                                | | `pod`=&lt;pod-name&gt; <br> `namespace`=&lt;pod-namespace&gt; <br> `qos_class`=&lt;BestEffort\|Burstable\|Guaranteed&gt; <br> `uid`=&lt;pod-uid&gt; | EXPERIMENTAL | - |
 | kube_pod_status_ready | Gauge | Describes whether the pod is ready to serve requests                  | | `pod`=&lt;pod-name&gt; <br> `namespace`=&lt;pod-namespace&gt; <br> `condition`=&lt;true\|false\|unknown&gt; <br> `uid`=&lt;pod-uid&gt; | STABLE | - |
 | kube_pod_status_scheduled | Gauge | Describes the status of the scheduling process for the pod            | |`pod`=&lt;pod-name&gt; <br> `namespace`=&lt;pod-namespace&gt; <br> `condition`=&lt;true\|false\|unknown&gt; <br> `uid`=&lt;pod-uid&gt; | STABLE | - |
 | kube_pod_container_info | Gauge | Information about a container in a pod                                | | `container`=&lt;container-name&gt; <br> `pod`=&lt;pod-name&gt; <br> `namespace`=&lt;pod-namespace&gt; <br> `image`=&lt;image-name&gt; <br> `image_id`=&lt;image-id&gt; <br> `image_spec`=&lt;image-spec&gt; <br> `container_id`=&lt;containerid&gt; <br> `uid`=&lt;pod-uid&gt; | STABLE | - |

internal/store/pod.go

@@ -82,6 +82,7 @@ func podMetricFamilies(allowAnnotationsList, allowLabelsList []string) []generat
 		createPodSpecVolumesPersistentVolumeClaimsReadonlyFamilyGenerator(),
 		createPodStartTimeFamilyGenerator(),
 		createPodStatusPhaseFamilyGenerator(),
+		createPodStatusQosClassFamilyGenerator(),
 		createPodStatusReadyFamilyGenerator(),
 		createPodStatusReasonFamilyGenerator(),
 		createPodStatusScheduledFamilyGenerator(),
@@ -1317,6 +1318,48 @@ func createPodStatusPhaseFamilyGenerator() generator.FamilyGenerator {
 	)
 }
 
+func createPodStatusQosClassFamilyGenerator() generator.FamilyGenerator {
+	return *generator.NewFamilyGeneratorWithStability(
+		"kube_pod_status_qos_class",
+		"The pods current qosClass.",
+		metric.Gauge,
+		basemetrics.ALPHA,
+		"",
+		wrapPodFunc(func(p *v1.Pod) *metric.Family {
+			class := p.Status.QOSClass
+			if class == "" {
+				return &metric.Family{
+					Metrics: []*metric.Metric{},
+				}
+			}
+
+			qosClasses := []struct {
+				v bool
+				n string
+			}{
+				{class == v1.PodQOSBestEffort, string(v1.PodQOSBestEffort)},
+				{class == v1.PodQOSBurstable, string(v1.PodQOSBurstable)},
+				{class == v1.PodQOSGuaranteed, string(v1.PodQOSGuaranteed)},
+			}
+
+			ms := make([]*metric.Metric, len(qosClasses))
+
+			for i, p := range qosClasses {
+				ms[i] = &metric.Metric{
+
+					LabelKeys:   []string{"qos_class"},
+					LabelValues: []string{p.n},
+					Value:       boolFloat64(p.v),
+				}
+			}
+
+			return &metric.Family{
+				Metrics: ms,
+			}
+		}),
+	)
+}
+
 func createPodStatusReadyFamilyGenerator() generator.FamilyGenerator {
 	return *generator.NewFamilyGeneratorWithStability(
 		"kube_pod_status_ready",

internal/store/pod_test.go

@@ -1294,6 +1294,26 @@ func TestPodStore(t *testing.T) {
 `,
 			MetricNames: []string{"kube_pod_status_phase", "kube_pod_status_reason"},
 		},
+		{
+			Obj: &v1.Pod{
+				ObjectMeta: metav1.ObjectMeta{
+					Name:      "pod1",
+					Namespace: "ns1",
+					UID:       "uid1",
+				},
+				Status: v1.PodStatus{
+					QOSClass: v1.PodQOSBestEffort,
+				},
+			},
+			Want: `
+				# HELP kube_pod_status_qos_class The pods current qosClass.
+				# TYPE kube_pod_status_qos_class gauge
+				kube_pod_status_qos_class{namespace="ns1",qos_class="BestEffort",pod="pod1",uid="uid1"} 1
+				kube_pod_status_qos_class{namespace="ns1",qos_class="Burstable",pod="pod1",uid="uid1"} 0
+				kube_pod_status_qos_class{namespace="ns1",qos_class="Guaranteed",pod="pod1",uid="uid1"} 0
+`,
+			MetricNames: []string{"kube_pod_status_qos_class"},
+		},
 		{
 			Obj: &v1.Pod{
 				ObjectMeta: metav1.ObjectMeta{
@@ -2079,7 +2099,7 @@ func BenchmarkPodStore(b *testing.B) {
 		},
 	}
 
-	expectedFamilies := 47
+	expectedFamilies := 48
 	for n := 0; n < b.N; n++ {
 		families := f(pod)
 		if len(families) != expectedFamilies {

pkg/app/server_test.go

@@ -238,6 +238,7 @@ func TestFullScrapeCycle(t *testing.T) {
 # HELP kube_pod_spec_volumes_persistentvolumeclaims_info [STABLE] Information about persistentvolumeclaim volumes in a pod.
 # HELP kube_pod_spec_volumes_persistentvolumeclaims_readonly [STABLE] Describes whether a persistentvolumeclaim is mounted read only.
 # HELP kube_pod_start_time [STABLE] Start time in unix timestamp for a pod.
+# HELP kube_pod_status_qos_class The pods current qosClass.
 # HELP kube_pod_status_phase [STABLE] The pods current phase.
 # HELP kube_pod_status_ready [STABLE] Describes whether the pod is ready to serve requests.
 # HELP kube_pod_status_reason The pod status reasons
@@ -285,6 +286,7 @@ func TestFullScrapeCycle(t *testing.T) {
 # TYPE kube_pod_spec_volumes_persistentvolumeclaims_readonly gauge
 # TYPE kube_pod_start_time gauge
 # TYPE kube_pod_status_phase gauge
+# TYPE kube_pod_status_qos_class gauge
 # TYPE kube_pod_status_ready gauge
 # TYPE kube_pod_status_reason gauge
 # TYPE kube_pod_status_scheduled gauge