pods: update init_cotainer_info metric

Author: changhyuni

docs/pod-metrics.md

@@ -36,7 +36,7 @@
 | kube_pod_created                                      | Gauge       | Unix creation timestamp                                                                                                                                                             | seconds                                        | `pod`=&lt;pod-name&gt; <br> `namespace`=&lt;pod-namespace&gt; <br> `uid`=&lt;pod-uid&gt;                                                                                                                                                                                                                                                                          | STABLE       | -      |
 | kube_pod_deletion_timestamp                           | Gauge       | Unix deletion timestamp                                                                                                                                                             | seconds                                        | `pod`=&lt;pod-name&gt; <br> `namespace`=&lt;pod-namespace&gt; <br> `uid`=&lt;pod-uid&gt;                                                                                                                                                                                                                                                                          | EXPERIMENTAL | -      |
 | kube_pod_restart_policy                               | Gauge       | Describes the restart policy in use by this pod                                                                                                                                     |                                                | `pod`=&lt;pod-name&gt; <br> `namespace`=&lt;pod-namespace&gt; <br> `type`=&lt;Always\|Never\|OnFailure&gt; <br> `uid`=&lt;pod-uid&gt;                                                                                                                                                                                                                             | STABLE       | -      |
-| kube_pod_init_container_info                          | Gauge       | Information about an init 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       | -      |
+| kube_pod_init_container_info                          | Gauge       | Information about an init 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; <br> `type`=&lt;Always&gt;                                                                                    | STABLE       | -      |
 | kube_pod_init_container_status_waiting                | Gauge       | Describes whether the init container is currently in waiting state                                                                                                                  |                                                | `container`=&lt;container-name&gt; <br> `pod`=&lt;pod-name&gt; <br> `namespace`=&lt;pod-namespace&gt; <br> `uid`=&lt;pod-uid&gt;                                                                                                                                                                                                                                  | STABLE       | -      |
 | kube_pod_init_container_status_waiting_reason         | Gauge       | Describes the reason the init container is currently in waiting state                                                                                                               |                                                | `container`=&lt;container-name&gt; <br> `pod`=&lt;pod-name&gt; <br> `namespace`=&lt;pod-namespace&gt; <br> `reason`=&lt;container-waiting-reason&gt; <br> `uid`=&lt;pod-uid&gt;                                                                                                                                                                                   | EXPERIMENTAL | -      |
 | kube_pod_init_container_status_running                | Gauge       | Describes whether the init container is currently in running state                                                                                                                  |                                                | `container`=&lt;container-name&gt; <br> `pod`=&lt;pod-name&gt; <br> `namespace`=&lt;pod-namespace&gt; <br> `uid`=&lt;pod-uid&gt;                                                                                                                                                                                                                                  | STABLE       | -      |

internal/store/pod.go

@@ -680,13 +680,18 @@ func createPodInitContainerInfoFamilyGenerator() generator.FamilyGenerator {
 			labelKeys := []string{"container", "image_spec", "image", "image_id", "container_id", "type"}
 
 			for _, c := range p.Spec.InitContainers {
+				restartPolicy := ""
+				if c.RestartPolicy != nil {
+					restartPolicy = string(*c.RestartPolicy)
+				}
+
 				for _, cs := range p.Status.InitContainerStatuses {
 					if cs.Name != c.Name {
 						continue
 					}
 					ms = append(ms, &metric.Metric{
 						LabelKeys:   labelKeys,
-						LabelValues: []string{cs.Name, c.Image, cs.Image, cs.ImageID, cs.ContainerID, c.RestartPolicy},
+						LabelValues: []string{cs.Name, c.Image, cs.Image, cs.ImageID, cs.ContainerID, restartPolicy},
 						Value:       1,
 					})
 				}

internal/store/pod_test.go

@@ -33,6 +33,7 @@ func TestPodStore(t *testing.T) {
 	runtimeclass := "foo"
 	startTime := 1501569018
 	metav1StartTime := metav1.Unix(int64(startTime), 0)
+	restartPolicyAlways := v1.ContainerRestartPolicyAlways
 
 	cases := []generateMetricsTestCase{
 		{
@@ -89,7 +90,7 @@ func TestPodStore(t *testing.T) {
 						{
 							Name:  "initContainer",
 							Image: "k8s.gcr.io/initfoo_spec",
-							RestartPolicy: v1.RestartPolicyAlways
+							RestartPolicy: &restartPolicyAlways,
 						},
 					},
 				},
@@ -125,7 +126,7 @@ func TestPodStore(t *testing.T) {
 				# TYPE kube_pod_init_container_info gauge
 				kube_pod_container_info{container="container2",container_id="docker://cd456",image_spec="k8s.gcr.io/hyperkube2_spec",image="k8s.gcr.io/hyperkube2",image_id="docker://sha256:bbb",namespace="ns2",pod="pod2",uid="uid2"} 1
 				kube_pod_container_info{container="container3",container_id="docker://ef789",image_spec="k8s.gcr.io/hyperkube3_spec",image="k8s.gcr.io/hyperkube3",image_id="docker://sha256:ccc",namespace="ns2",pod="pod2",uid="uid2"} 1
-				kube_pod_init_container_info{container="initContainer",container_id="docker://ef123",image_spec="k8s.gcr.io/initfoo_spec",image="k8s.gcr.io/initfoo",image_id="docker://sha256:wxyz",namespace="ns2",pod="pod2",uid="uid2"} 1`,
+				kube_pod_init_container_info{container="initContainer",container_id="docker://ef123",image_spec="k8s.gcr.io/initfoo_spec",image="k8s.gcr.io/initfoo",image_id="docker://sha256:wxyz",namespace="ns2",pod="pod2",uid="uid2",type="Always"} 1`,
 			MetricNames: []string{"kube_pod_container_info", "kube_pod_init_container_info"},
 		},
 		{