[openstack-dev] [nova] Versioned notifications... who cares about the version?

Kevin L. Mitchell kevin.mitchell at rackspace.com
Mon Nov 23 17:08:46 UTC 2015


On Mon, 2015-11-23 at 10:01 +0000, Alexis Lee wrote:
> gord chung said on Fri, Nov 20, 2015 at 01:32:02PM -0500:
> > On 20/11/15 11:33 AM, Alexis Lee wrote:
> > >why would a producer spit out non-useful datapoints? If no-one cares
> > >or will ever care, it simply shouldn't be included.
> > 
> > ... right now the
> > producer is just sending out a grab bag of data that it thinks is
> > important but doesn't define who the audience is. ...
> >
> > ... whoever the producer of notifications is, it should know it's
> > audience.
> 
> Here I, with cdent, have to disagree. The criterion has to be
> "potentially useful to someone", rather than tailoring production to the
> known audience.
> 
> > >The problem is knowing what each consumer thinks is interesting and that
> > >isn't something that can be handled by the producer.
> 
> ^ this is important.

I think there is a minor disconnect here; when Gord talks about
tailoring to a specific audience, there seems to be a jump to the
conclusion that the audience must be ceilometer.  I think Gord is
instead suggesting what you could think of as an audience *class*—this
notification is intended for metrics consumers, this one is intended for
log monitors, etc.  That kind of data could be included in the actual
notification, so you still have a single notification stream.  (I could
envision later refinements allowing filtering, maybe by using multiple
queues…)
-- 
Kevin L. Mitchell <kevin.mitchell at rackspace.com>
Rackspace




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