namespace has to be kube-system

for service discovery to work within prometheus configuration (ServiceMonitor k8s-app) these service and endpoints should belong to kube-system namespace. Otherwise the service monitor won't fetch it.

manifests/k8s/minikube/kube-controller-manager.yaml

 apiVersion: v1
 kind: Service
 metadata:
+  namespace: kube-system
   name: kube-controller-manager-prometheus-discovery
   labels:
     k8s-app: kube-controller-manager
@@ -16,6 +17,7 @@ spec:
 apiVersion: v1
 kind: Endpoints
 metadata:
+  namespace: kube-system
   name: kube-controller-manager-prometheus-discovery
   labels:
     k8s-app: kube-controller-manager