add new metric kube_pod_service_account

Author: swarup-stripe

docs/pod-metrics.md

@@ -52,6 +52,7 @@
 | kube_pod_status_scheduled_time | Gauge | Unix timestamp when pod moved into scheduled status                   | seconds |`pod`=&lt;pod-name&gt; <br> `namespace`=&lt;pod-namespace&gt; <br> `uid`=&lt;pod-uid&gt; | STABLE | - |
 | kube_pod_status_unschedulable | Gauge | Describes the unschedulable status for the pod                        | |`pod`=&lt;pod-name&gt; <br> `namespace`=&lt;pod-namespace&gt; <br> `uid`=&lt;pod-uid&gt; | STABLE | - |
 | kube_pod_tolerations | Gauge | Information about the pod tolerations                                 | | `pod`=&lt;pod-name&gt; <br> `namespace`=&lt;pod-namespace&gt; <br> `uid`=&lt;pod-uid&gt; <br> `key`=&lt;toleration-key&gt; <br> `operator`=&lt;toleration-operator&gt; <br> `value`=&lt;toleration-value&gt; <br> `effect`=&lt;toleration-effect&gt; `toleration_seconds`=&lt;toleration-seconds&gt; | EXPERIMENTAL | - |
+| kube_pod_service_account | Gauge | The service account for a pod                                 | | `pod`=&lt;pod-name&gt; <br> `namespace`=&lt;pod-namespace&gt; <br> `uid`=&lt;pod-uid&gt; <br> `service_account`=&lt;service_account&gt; | EXPERIMENTAL | - |
 
 ## Useful metrics queries
 

internal/store/pod.go

@@ -92,6 +92,7 @@ func podMetricFamilies(allowAnnotationsList, allowLabelsList []string) []generat
 		createPodStatusUnschedulableFamilyGenerator(),
 		createPodTolerationsFamilyGenerator(),
 		createPodNodeSelectorsFamilyGenerator(),
+		createPodServiceAccountFamilyGenerator(),
 	}
 }
 
@@ -1652,6 +1653,27 @@ func createPodNodeSelectorsFamilyGenerator() generator.FamilyGenerator {
 	)
 }
 
+func createPodServiceAccountFamilyGenerator() generator.FamilyGenerator {
+	return *generator.NewFamilyGeneratorWithStability(
+		"kube_pod_service_account",
+		"The service account for a pod.",
+		metric.Gauge,
+		basemetrics.ALPHA,
+		"",
+		wrapPodFunc(func(p *v1.Pod) *metric.Family {
+			m := metric.Metric{
+				LabelKeys:   []string{"service_account"},
+				LabelValues: []string{p.Spec.ServiceAccountName},
+				Value:       1,
+			}
+
+			return &metric.Family{
+				Metrics: []*metric.Metric{&m},
+			}
+		}),
+	)
+}
+
 func wrapPodFunc(f func(*v1.Pod) *metric.Family) func(interface{}) *metric.Family {
 	return func(obj interface{}) *metric.Family {
 		pod := obj.(*v1.Pod)

internal/store/pod_test.go

@@ -2066,6 +2066,26 @@ func TestPodStore(t *testing.T) {
 				"kube_pod_tolerations",
 			},
 		},
+		{
+			Obj: &v1.Pod{
+				ObjectMeta: metav1.ObjectMeta{
+					Name:      "pod1",
+					Namespace: "ns1",
+					UID:       "uid1",
+				},
+				Spec: v1.PodSpec{
+					ServiceAccountName: "service-account-name",
+				},
+			},
+			Want: `
+				# HELP kube_pod_service_account The service account for a pod.
+				# TYPE kube_pod_service_account gauge
+				kube_pod_service_account{namespace="ns1",pod="pod1",service_account="service-account-name",uid="uid1"} 1
+			`,
+			MetricNames: []string{
+				"kube_pod_service_account",
+			},
+		},
 	}
 
 	for i, c := range cases {
@@ -2161,7 +2181,7 @@ func BenchmarkPodStore(b *testing.B) {
 		},
 	}
 
-	expectedFamilies := 50
+	expectedFamilies := 51
 	for n := 0; n < b.N; n++ {
 		families := f(pod)
 		if len(families) != expectedFamilies {

pkg/app/server_test.go

@@ -235,6 +235,7 @@ func TestFullScrapeCycle(t *testing.T) {
 # HELP kube_pod_overhead_cpu_cores The pod overhead in regards to cpu cores associated with running a pod.
 # HELP kube_pod_overhead_memory_bytes The pod overhead in regards to memory associated with running a pod.
 # HELP kube_pod_runtimeclass_name_info The runtimeclass associated with the pod.
+# HELP kube_pod_service_account The service account for a pod.
 # HELP kube_pod_owner [STABLE] Information about the Pod's owner.
 # HELP kube_pod_restart_policy [STABLE] Describes the restart policy in use by this pod.
 # HELP kube_pod_spec_volumes_persistentvolumeclaims_info [STABLE] Information about persistentvolumeclaim volumes in a pod.
@@ -284,6 +285,7 @@ func TestFullScrapeCycle(t *testing.T) {
 # TYPE kube_pod_overhead_cpu_cores gauge
 # TYPE kube_pod_overhead_memory_bytes gauge
 # TYPE kube_pod_runtimeclass_name_info gauge
+# TYPE kube_pod_service_account gauge
 # TYPE kube_pod_owner gauge
 # TYPE kube_pod_restart_policy gauge
 # TYPE kube_pod_spec_volumes_persistentvolumeclaims_info gauge
@@ -334,6 +336,7 @@ kube_pod_info{namespace="default",pod="pod0",uid="abc-0",host_ip="1.1.1.1",pod_i
 kube_pod_labels{namespace="default",pod="pod0",uid="abc-0"} 1
 kube_pod_owner{namespace="default",pod="pod0",uid="abc-0",owner_kind="",owner_name="",owner_is_controller=""} 1
 kube_pod_restart_policy{namespace="default",pod="pod0",uid="abc-0",type="Always"} 1
+kube_pod_service_account{namespace="default",pod="pod0",uid="abc-0",service_account=""} 1
 kube_pod_status_phase{namespace="default",pod="pod0",uid="abc-0",phase="Failed"} 0
 kube_pod_status_phase{namespace="default",pod="pod0",uid="abc-0",phase="Pending"} 0
 kube_pod_status_phase{namespace="default",pod="pod0",uid="abc-0",phase="Running"} 1