kube-state-metrics is a simple service that listens to the Kubernetes API server and generates metrics about the state of the objects.
The exposed metrics can be found here:
https://github.com/kubernetes/kube-state-metrics/blob/master/docs/README.md#exposed-metrics

The metrics are exported on the HTTP endpoint /metrics on the listening port.
In your case, {{ template "kube-state-metrics.fullname" . }}.{{ template "kube-state-metrics.namespace" . }}.svc.cluster.local:{{ .Values.service.port }}/metrics

They are served either as plaintext or protobuf depending on the Accept header.
They are designed to be consumed either by Prometheus itself or by a scraper that is compatible with scraping a Prometheus client endpoint.

{{- if .Values.kubeRBACProxy.enabled}}

kube-rbac-proxy endpoint protections is enabled:
- Metrics endpoints are now HTTPS
- Ensure that the client authenticates the requests (e.g. via service account) with the following role permissions:
```
rules:
  - apiGroups: [ "" ]
    resources: ["services/{{ template "kube-state-metrics.fullname" . }}"]
    verbs:
      - get
```
{{- end }}