This patch consits of:
* New ops interface grafana_dashboard based on the existing reactive
interface
* New ops http interface.
* Dashboard registers grafana dashboards with grafana. These
dashboards are taken from upstream ceph *1. Ideally the charm
would pick these up from ceph packaging but they are currently
not included. With the exception of host-details.json and
hosts-overview.json the dashboards are unchanged. host-details.json
and hosts-overview.json both needed changed to make the compatable
with the metrics telegraf is sending.
* alertmanager-service and prometheus relations
using the http ops interface allowing there api endpoints to be
registered with the dashboard.
NOTE: ceph-mon has an existing relation with Prometheus (
ceph-mon:prometheus <-> prometheus:target ) but prometheus does not
publish its api endpoint on that relation. So, the dashboard adds a
prometheus:website <-> ceph-dashboard:prometheus relation. This
allows the dashboard to set set-prometheus-api-host.
*1 https://github.com/ceph/ceph/tree/master/monitoring/grafana/dashboards
Change-Id: Ic4522cc601895c9a79489df985a6e81fa70fb9e5
d4c8683e68