etcd metrics missing with kube-prometheus-stack

[voidquark]

What happened?

etcd metrics are not be available in the Prometheus instance of the kube prometheus stack if the service labels are misconfigured.

What did you expect to happen?

I expected, based on the provided documentation, that metrics would be available in the Prometheus instance deployed with the "kube-prometheus-stack".

How can we reproduce it (as minimally and precisely as possible)?

Current documentation: (https://kubespray.io/#/docs/operations/etcd?id=metrics)

etcd_deployment_type: host
etcd_metrics_port: 2381
etcd_metrics_service_labels:
  k8s-app: etcd
  app.kubernetes.io/managed-by: Kubespray
  app: kube-prometheus-stack-kube-etcd
  release: prometheus-stack

In Helm chart of kube prometheus stack:

kubeEtcd:
  service:
    enabled: false

Corrected value for release:

etcd_metrics_service_labels:
  k8s-app: etcd
  app.kubernetes.io/managed-by: Kubespray
  app: kube-prometheus-stack-kube-etcd
  release: kube-prometheus-stack

After updating the release label as shown above, metrics become available in the kube prometheus stack. Therefore, it would make sense to update the documentation to reflect this change.

OS

Ubuntu 24

Version of Ansible

ansible-core==2.17.3

Version of Python

Python 3.12.3

Version of Kubespray (commit)

2.29.1

Network plugin used

cilium

Full inventory with variables

etcd_deployment_type: host
etcd_metrics_port: 2381
etcd_metrics_service_labels:
k8s-app: etcd
app.kubernetes.io/managed-by: Kubespray
app: kube-prometheus-stack-kube-etcd
release: kube-prometheus-stack

Command used to invoke ansible

Ansible Semaphore

Output of ansible run

N/A

Anything else we need to know

No response