fix: prometheus network policy let prometheus-adapter pass (#1982)

manifests/prometheus-networkPolicy.yaml

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