Bug Confirmed - http://paste.ubuntu.com/25880271/

Deploying nova-compute to a host that previously had a nova-compute
deployed to it (i.e. hostname recycled) will result in nova hypervisor
stats reporting stats from both the deleted and active entries of that
service.

In terms of the nova-compute charm i think the topic of how it behaves
when removing units has come up before i.e. that it should somehow mark
the service/host as deleted when removing a unit of nova-compute. The
problem with doing this is that the compute service would need to be
provided with admin credentials since it no longer has direct access to
the db. This has been previously raised and the bug is still pending -
https://bugs.launchpad.net/charms/+source/nova-compute/+bug/1317560.

** Changed in: nova (Ubuntu)
       Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/1719770

Title:
  hypervisor stats issue after charm removal if nova-compute service not
  disabled first

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