add metadata to instance counters

[Doug Hellmann]

the c1 counter in ceilometer/compute/notifications.py and the pollsters in the agent code do not include enough metadata about the instance (location details such as zone and region, especially).

[Julien Danjou (jdanjou)]

According to http://wiki.openstack.org/SystemUsageData events are local to a zone/region. So we cannot support more regions without connecting to several RPC buses.

[StackForge Gerrit (gerrig)]

Fix proposed to branch: master
Review: https://review.stackforge.org/163

[Doug Hellmann (doug-hellmann)]

We could run collectors in each zone and have them write to the central database, or have a separate database for each zone and aggregate the data outside of ceilometer. I don't think connecting to multiple buses makes sense because the zones are likely to be isolated from each other (at least logically and probably physically, in different data centers).

[Doug Hellmann (doug-hellmann)]

The change to nova.notifications is up for review in https://review.openstack.org/#/c/8659/

[StackForge Gerrit (gerrig)]

Fix proposed to branch: master
Review: https://review.stackforge.org/225

[StackForge Gerrit (gerrig)]

Reviewed: https://review.stackforge.org/225
Committed: http://github.com/stackforge/ceilometer/commit/bf555549df9bb668d0a049d333a0e36994847a1b
Submitter: Jenkins
Branch: master

commit bf555549df9bb668d0a049d333a0e36994847a1b
Author: Doug Hellmann <email address hidden>
Date: Mon Jun 18 12:28:06 2012 -0400

    Add instance metadata from notification events

    bug 1006120

    This change depends on a change to nova to include the extra data
    in the outgoing notifications.

    Change-Id: Ieaee00f5f6c0a9f6d00843adbcc2cd995334bbd1

[Graham Binns (gmb)]

Fix released in ceilometer 0.1/folsom.