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

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

roles/kubernetes-apps/ansible/tasks/etcd_metrics.yml

@@ -0,0 +1,21 @@
+---
+- name: Kubernetes Apps | Lay down etcd_metrics templates
+  template:
+    src: "{{ item.file }}.j2"
+    dest: "{{ kube_config_dir }}/{{ item.file }}"
+  with_items:
+    - { file: etcd_metrics-endpoints.yml, type: endpoints, name: etcd-metrics }
+    - { file: etcd_metrics-service.yml, type: service, name: etcd-metrics }
+  register: manifests
+  when: inventory_hostname == groups['kube_control_plane'][0]
+
+- name: Kubernetes Apps | Start etcd_metrics
+  kube:
+    name: "{{ item.item.name }}"
+    namespace: kube-system
+    kubectl: "{{ bin_dir }}/kubectl"
+    resource: "{{ item.item.type }}"
+    filename: "{{ kube_config_dir }}/{{ item.item.file }}"
+    state: "latest"
+  with_items: "{{ manifests.results }}"
+  when: inventory_hostname == groups['kube_control_plane'][0]