Allow extensions to define cluster features (#1125)

Signed-off-by: Jari Kolehmainen <jari.kolehmainen@gmail.com>

extensions/metrics-cluster-feature/resources/03-service.yml

@@ -0,0 +1,16 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: prometheus
+  namespace: lens-metrics
+  annotations:
+    prometheus.io/scrape: 'true'
+spec:
+  type: ClusterIP
+  selector:
+    name: prometheus
+  ports:
+    - name: web
+      protocol: TCP
+      port: 80
+      targetPort: 9090