Address comments

manifests/alertmanager-serviceMonitor.yaml

@@ -0,0 +1,17 @@
+apiVersion: monitoring.coreos.com/v1
+kind: ServiceMonitor
+metadata:
+  labels:
+    k8s-app: alertmanager
+  name: alertmanager
+  namespace: monitoring
+spec:
+  endpoints:
+  - interval: 30s
+    port: web
+  namespaceSelector:
+    matchNames:
+    - monitoring
+  selector:
+    matchLabels:
+      alertmanager: main