[openstack-dev] [ceilometer] indicating sample provenance

Chris Dent chdent at redhat.com
Wed Aug 20 17:23:30 UTC 2014

One of the outcomes from Juno will be horizontal scalability in the
central agent and alarm evaluator via partitioning[1]. The compute
agent will get the same capability if you choose to use it, but it
doesn't make quite as much sense.

I haven't investigated the alarm evaluator side closely yet, but one
concern I have with the central agent partitioning is that, as far
as I can tell, it will result in stored samples that give no
indication of which (of potentially very many) central-agent it came

This strikes me as a debugging nightmare when something goes wrong
with the content of a sample that makes it all the way to storage.
We need some way, via the artifact itself, to narrow the scope of
our investigation.

a) Am I right that no indicator is there?

b) Assuming there should be one:

    * Where should it go? Presumably it needs to be an attribute of
      each sample because as agents leave and join the group, where
      samples are published from can change.

    * How should it be named? The never-ending problem.


[1] https://review.openstack.org/#/c/113549/
[2] https://review.openstack.org/#/c/115237/

Chris Dent tw:@anticdent freenode:cdent

More information about the OpenStack-dev mailing list