ensure monitoring values is subbed under kubePrometheusStack

chart/templates/monitoring/monitoring.yaml

@@ -42,14 +42,15 @@ spec:
       imagePullSecrets:
         - name: private-registry
 
-    grafana:
-      image:
-        pullSecrets:
-        - private-registry
+    kubePrometheusStack:
+      grafana:
+        image:
+          pullSecrets:
+          - private-registry
 
-    prometheusOperator:
-      createCustomResource: true
-      manageCrds: true
+      prometheusOperator:
+        createCustomResource: true
+        manageCrds: true
 
   # TODO: DRY this up
   {{- if or .Values.gatekeeper.enabled .Values.istio.enabled }}