add ownerReferences to created Service object

pkg/alertmanager/statefulset.go

@@ -146,6 +146,14 @@ func makeStatefulSetService(p *monitoringv1.Alertmanager, config Config) *v1.Ser
 			Labels: config.Labels.Merge(map[string]string{
 				"operated-alertmanager": "true",
 			}),
+			OwnerReferences: []metav1.OwnerReference{
+				metav1.OwnerReference{
+					Name:       p.GetName(),
+					Kind:       p.Kind,
+					APIVersion: p.APIVersion,
+					UID:        p.GetUID(),
+				},
+			},
 		},
 		Spec: v1.ServiceSpec{
 			ClusterIP: "None",

pkg/k8sutil/k8sutil.go

@@ -133,6 +133,7 @@ func CreateOrUpdateService(sclient clientv1.ServiceInterface, svc *v1.Service) e
 		}
 	} else {
 		svc.ResourceVersion = service.ResourceVersion
+		svc.SetOwnerReferences(mergeOwnerReferences(service.GetOwnerReferences(), svc.GetOwnerReferences()))
 		_, err := sclient.Update(svc)
 		if err != nil && !apierrors.IsNotFound(err) {
 			return errors.Wrap(err, "updating service object failed")
@@ -203,3 +204,16 @@ func SanitizeVolumeName(name string) string {
 	}
 	return strings.Trim(name, "-")
 }
+
+func mergeOwnerReferences(old []metav1.OwnerReference, new []metav1.OwnerReference) []metav1.OwnerReference {
+	existing := make(map[metav1.OwnerReference]bool)
+	for _, ownerRef := range old {
+		existing[ownerRef] = true
+	}
+	for _, ownerRef := range new {
+		if _, ok := existing[ownerRef]; !ok {
+			old = append(old, ownerRef)
+		}
+	}
+	return old
+}

pkg/prometheus/statefulset.go

@@ -254,6 +254,14 @@ func makeStatefulSetService(p *monitoringv1.Prometheus, config Config) *v1.Servi
 	svc := &v1.Service{
 		ObjectMeta: metav1.ObjectMeta{
 			Name: governingServiceName,
+			OwnerReferences: []metav1.OwnerReference{
+				metav1.OwnerReference{
+					Name:       p.GetName(),
+					Kind:       p.Kind,
+					APIVersion: p.APIVersion,
+					UID:        p.GetUID(),
+				},
+			},
 			Labels: config.Labels.Merge(map[string]string{
 				"operated-prometheus": "true",
 			}),