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

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

roles/kubernetes-apps/ansible/defaults/main.yml

@@ -25,6 +25,13 @@ dns_autoscaler_cpu_requests: 20m
 dns_autoscaler_memory_requests: 10Mi
 dns_autoscaler_deployment_nodeselector: "kubernetes.io/os: linux"
 
+# etcd metrics
+# etcd_metrics_service_labels:
+#   k8s-app: etcd
+#   app.kubernetes.io/managed-by: Kubespray
+#   app: kube-prometheus-stack-kube-etcd
+#   release: prometheus-stack
+
 # Netchecker
 deploy_netchecker: false
 netchecker_port: 31081