[grafana] Services are not selectable by label selectors independently

[sringel]

Goal:

Selecting of the base or headless service independently should be possible with label selectors.

Problem:

The labels generated for both services are not unique and hence there isn't a combo of labels that can be used to independently select an individual service.

Workaround (Partial):

Add a label to the base service using:

service:
  labels:
    some-label-key: some-value

This will allow the base service to be selected but not the headless service. It is also not future proof as the headless service template may at some point be updated to include .Values.service.labels.

Recommended action:

Add a label to both service templates that ensures the labels on each service will always be unique.

Base service
grafana.com/grafana-service-type: base

Headless service
grafana.com/grafana-service-type: headless