Allow prom to scrape metrics

chart/templates/bigbang/networkpolicies/ingress-monitoring.yaml

@@ -2,7 +2,7 @@
 apiVersion: networking.k8s.io/v1
 kind: NetworkPolicy
 metadata:
-  name: ingress-grafana
+  name: ingress-monitoring
   namespace: {{ .Release.Namespace }}
 spec:
   podSelector: {}
@@ -16,6 +16,12 @@ spec:
       podSelector:
         matchLabels:
           app.kubernetes.io/name: grafana
+    - namespaceSelector:
+        matchLabels:
+          app.kubernetes.io/name: monitoring
+      podSelector:
+        matchLabels:
+          app.kubernetes.io/name: prometheus
     ports:
     - port: {{ .Values.service.port }}
       protocol: TCP