Multiple prometheus-client relations results in only one having relation data

[Xav Paice]

If I relate Telegraf using the prometheus-client relation (http interface) to more than one application, the first gets 'hostname' and 'port' information in the relation data, but the second (and subsequent) applications do not get these fields filled in.

Potentially caused by the following lines:

  @when_not("prometheus-client.available")
  @when_not("plugins.prometheus-client.configured")
  def configure_prometheus_client():
      # stuff
      set_flag("plugins.prometheus-client.configured")

This would set the flag after the first relation is joined, and not re-run configure_prometheus_client() when the next relation joins.

[Xav Paice (xavpaice)]

Assigned high priority because this is preventing deployment of the new K8s based Prometheus alongside the existing one, therefore delaying development.