jsonnet: unify metadata management

jsonnet/kube-prometheus/components/node-exporter.libsonnet

@@ -49,6 +49,11 @@ function(params) {
   // Safety check
   assert std.isObject(ne._config.resources),
   assert std.isObject(ne._config.mixin._config),
+  _metadata:: {
+    name: ne._config.name,
+    namespace: ne._config.namespace,
+    labels: ne._config.commonLabels,
+  },
 
   mixin:: (import 'github.com/prometheus/node_exporter/docs/node-mixin/mixin.libsonnet') +
           (import 'github.com/kubernetes-monitoring/kubernetes-mixin/lib/add-runbook-links.libsonnet') {
@@ -58,10 +63,9 @@ function(params) {
   prometheusRule: {
     apiVersion: 'monitoring.coreos.com/v1',
     kind: 'PrometheusRule',
-    metadata: {
-      labels: ne._config.commonLabels + ne._config.mixin.ruleLabels,
+    metadata: ne._metadata {
+      labels+: ne._config.mixin.ruleLabels,
       name: ne._config.name + '-rules',
-      namespace: ne._config.namespace,
     },
     spec: {
       local r = if std.objectHasAll(ne.mixin, 'prometheusRules') then ne.mixin.prometheusRules.groups else [],
@@ -73,10 +77,7 @@ function(params) {
   clusterRoleBinding: {
     apiVersion: 'rbac.authorization.k8s.io/v1',
     kind: 'ClusterRoleBinding',
-    metadata: {
-      name: ne._config.name,
-      labels: ne._config.commonLabels,
-    },
+    metadata: ne._metadata,
     roleRef: {
       apiGroup: 'rbac.authorization.k8s.io',
       kind: 'ClusterRole',
@@ -92,10 +93,7 @@ function(params) {
   clusterRole: {
     apiVersion: 'rbac.authorization.k8s.io/v1',
     kind: 'ClusterRole',
-    metadata: {
-      name: ne._config.name,
-      labels: ne._config.commonLabels,
-    },
+    metadata: ne._metadata,
     rules: [
       {
         apiGroups: ['authentication.k8s.io'],
@@ -113,21 +111,13 @@ function(params) {
   serviceAccount: {
     apiVersion: 'v1',
     kind: 'ServiceAccount',
-    metadata: {
-      name: ne._config.name,
-      namespace: ne._config.namespace,
-      labels: ne._config.commonLabels,
-    },
+    metadata: ne._metadata,
   },
 
   service: {
     apiVersion: 'v1',
     kind: 'Service',
-    metadata: {
-      name: ne._config.name,
-      namespace: ne._config.namespace,
-      labels: ne._config.commonLabels,
-    },
+    metadata: ne._metadata,
     spec: {
       ports: [
         { name: 'https', targetPort: 'https', port: ne._config.port },
@@ -140,11 +130,7 @@ function(params) {
   serviceMonitor: {
     apiVersion: 'monitoring.coreos.com/v1',
     kind: 'ServiceMonitor',
-    metadata: {
-      name: ne._config.name,
-      namespace: ne._config.namespace,
-      labels: ne._config.commonLabels,
-    },
+    metadata: ne._metadata,
     spec: {
       jobLabel: 'app.kubernetes.io/name',
       selector: {
@@ -221,11 +207,7 @@ function(params) {
     {
       apiVersion: 'apps/v1',
       kind: 'DaemonSet',
-      metadata: {
-        name: ne._config.name,
-        namespace: ne._config.namespace,
-        labels: ne._config.commonLabels,
-      },
+      metadata: ne._metadata,
       spec: {
         selector: { matchLabels: ne._config.selectorLabels },
         updateStrategy: {
@@ -260,6 +242,4 @@ function(params) {
         },
       },
     },
-
-
 }