Dashboards can only be registered once unless charm is upgraded

[Paul Goins]

I believe I've found a bug regarding dashboard registration. This prevents both registration with multiple grafana apps via a "dashboards" relation, and causes problems if it is necessary to redeploy a grafana unit or app.

The bug is likely caused by this clause protecting the register_grafana_dashboards() function:

  @when_all("leadership.is_leader", "endpoint.dashboards.joined")
  @when_not("libvirt-exporter.dashboard-registered") # <-- Here is where I think the bug occurs
  def register_grafana_dashboards():

The libvirt-exporter.dashboard-registered flag only gets cleared on upgrade-charm hooks.

The workaround for this is likely:

  juju exec -u prometheus-libvirt-exporter/leader 'charms.reactive clear_flag libvirt-exporter.dashboard-registered'