Add loki datsource to grafana

ansible/roles/apps/templates/monitoring-settings.yaml

@@ -136,3 +136,9 @@ grafana:
     enabled: true
     size: 2Gi
     accessModes: ["ReadWriteOnce"]
+
+  additionalDataSources:
+  - name: Loki
+    url: http://loki-stack.oas.svc.cluster.local:3100
+    type: loki
+    access: proxy