add service monitor to grafana

jsonnet/kube-prometheus/kube-prometheus.libsonnet

@@ -15,7 +15,32 @@ local configMapList = k.core.v1.configMapList;
     namespace: k.core.v1.namespace.new($._config.namespace),
   },
   grafana+:: {
+    local serviceLabels = {
+      app: 'grafana',
+    },
     dashboardDefinitions: configMapList.new(super.dashboardDefinitions),
+    service+: {
+      labels+: serviceLabels,
+    },
+    serviceMonitor: {
+      apiVersion: 'monitoring.coreos.com/v1',
+      kind: 'ServiceMonitor',
+      metadata: {
+        name: 'grafana',
+        namespace: $._config.namespace,
+      },
+      spec: {
+        selector: {
+          matchLabels: serviceLabels,
+        },
+        endpoints: [
+          {
+            port: 'http',
+            interval: '15s',
+          },
+        ],
+      },
+    },
   },
 } + {
   _config+:: {

manifests/grafana-service.yaml

 apiVersion: v1
 kind: Service
+labels:
+  app: grafana
 metadata:
   name: grafana
   namespace: monitoring

manifests/grafana-serviceMonitor.yaml

+apiVersion: monitoring.coreos.com/v1
+kind: ServiceMonitor
+metadata:
+  name: grafana
+  namespace: monitoring
+spec:
+  endpoints:
+  - interval: 15s
+    port: http
+  selector:
+    matchLabels:
+      app: grafana