[feature] grafana: add prometheus datasource, add dashboard provisioner and node_exporter dashboard

grafana/provisioning/dashboards/dashboard.yml

@@ -0,0 +1,13 @@
+---
+apiVersion: 1
+
+providers:
+  - name: 'Dashboards'
+    orgId: 1
+    folder: ''
+    type: file
+    disableDeletion: false
+    editable: true
+    allowUiUpdates: true
+    options:
+      path: /etc/grafana/provisioning/dashboards

grafana/provisioning/datasources/datasource.yml

@@ -13,4 +13,10 @@ datasources:
     url: http://loki:3100
     jsonData:
       maxLines: 1000
-    editable: true
+    editable: true
+  - name: Prometheus
+    type: prometheus
+    orgId: 1
+    url: http://prometheus:9090
+    editable: true
+    version: 1