Add servicemonitor to prod as well

fleet.yaml

@@ -7,6 +7,15 @@ helm:
     namespace: cert-manager
     installCRDs: true
 targetCustomizations:
+  - name: prod
+    helm:
+      values:
+        prometheus:
+          servicemonitor:
+            enabled: true
+    clusterSelector:
+      matchLabels:
+        env: prod
   - name: rancher
     helm:
       values: