update: add label

Signed-off-by: Wen Zhou <wenzhou@redhat.com>
(cherry picked from commit ff81652)

Author: zdtsw

config/prometheus/servicemonitor.yaml

@@ -9,8 +9,9 @@ spec:
   selector:
     matchLabels:
       control-plane: controller-manager
+      app.kubernetes.io/name: workload-variant-autoscaler
   endpoints:
   - port: http
     scheme: http
     interval: 30s
-    path: /metrics 
+    path: /metrics