Allow to scrape etcd metrics using a service (#8203)

Signed-off-by: Mathieu Parent <math.parent@gmail.com>

roles/kubernetes-apps/ansible/templates/etcd_metrics-endpoints.yml.j2

@@ -0,0 +1,17 @@
+apiVersion: v1
+kind: Endpoints
+metadata:
+  name: etcd-metrics
+  namespace: kube-system
+  labels:
+    k8s-app: etcd
+    app.kubernetes.io/managed-by: Kubespray
+subsets:
+{% for etcd_metrics_address in etcd_metrics_addresses.split(',') %}
+  - addresses:
+      - ip: {{ etcd_metrics_address | urlsplit('hostname') }}
+    ports:
+      - name: http-metrics
+        port: {{ etcd_metrics_address | urlsplit('port') }}
+        protocol: TCP
+{% endfor %}

roles/kubernetes-apps/ansible/templates/etcd_metrics-service.yml.j2

@@ -0,0 +1,13 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: etcd-metrics
+  namespace: kube-system
+  labels:
+    {{ etcd_metrics_service_labels | to_yaml(indent=2, width=1337) | indent(width=4) }}
+spec:
+  ports:
+    - name: http-metrics
+      protocol: TCP
+      port: {{ etcd_metrics_port }}
+      # targetPort: