add servicemonitor

Signed-off-by: walnuts1018 <[email protected]>

k8s/apps/loki/servicemonitor.jsonnet

@@ -0,0 +1,47 @@
+local helmname = (import 'helm.jsonnet').spec.source.helm.releaseName;
+
+{
+  apiVersion: 'monitoring.coreos.com/v1',
+  kind: 'ServiceMonitor',
+  metadata: {
+    name: 'loki',
+    namespace: 'loki',
+    labels: (import '../../components/labels.libsonnet') + { appname: (import 'app.json5').name },
+  },
+  spec: {
+    selector: {
+      matchLabels: {
+        'app.kubernetes.io/name': 'loki',
+        'app.kubernetes.io/instance': helmname,
+      },
+      matchExpressions: [
+        {
+          key: 'prometheus.io/service-monitor',
+          operator: 'NotIn',
+          values: ['false'],
+        },
+      ],
+    },
+    endpoints: [
+      {
+        port: 'http-metrics',
+        path: '/metrics',
+        interval: '15s',
+        relabelings: [
+          {
+            sourceLabels: ['job'],
+            action: 'replace',
+            replacement: 'default/$1',
+            targetLabel: 'job',
+          },
+          {
+            action: 'replace',
+            replcaement: helmname,
+            targetLabel: 'cluster',
+          },
+        ],
+        scheme: 'http',
+      },
+    ],
+  },
+}