Add Prom+Grafana monitoring stack

manifests/monitoring/grafana/datasources.yaml

@@ -0,0 +1,18 @@
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: grafana-datasources
+  namespace: gitops-system
+data:
+  datasources.yaml: |-
+    apiVersion: 1
+    deleteDatasources:
+      - name: prometheus
+    datasources:
+    - name: prometheus
+      type: prometheus
+      access: proxy
+      url: http://prometheus:9090
+      isDefault: true
+      editable: true
+      version: 1