jsonnet/components/prometheus: Fix grafana network access

Signed-off-by: ArthurSens <arthursens2005@gmail.com>

manifests/prometheus-networkPolicy.yaml

@@ -22,6 +22,13 @@ spec:
       protocol: TCP
     - port: 8080
       protocol: TCP
+  - from:
+    - podSelector:
+        matchLabels:
+          app.kubernetes.io/name: grafana
+    ports:
+    - port: 9090
+      protocol: TCP
   podSelector:
     matchLabels:
       app.kubernetes.io/component: prometheus