[openstack-dev] [Ceilometer][Metering] Metadata on Meter table - use cases from StackTach ...

Julien Danjou julien at danjou.info
Wed Jan 30 14:39:47 UTC 2013

On Wed, Jan 30 2013, Sandy Walsh wrote:

> I don't understand the difference? Metering assumes archiving. If any
> company with SEC requirements wants to use Ceilometer for billing, for
> example, they'll have to store 90+ days of data.
> Can you elaborate on the ceilometer mandate?

Notifications aren't all about metering. Actually, they are called
"notifications", not "meters". Things would be different if
Nova/Glance/etc would emit directly meters, for example (hint hint).

Remember that Ceilometer is also providing an API endpoint to be
queried, and what it stores via its `collector' is directly made to be
used via its API.
So the essence of the collector service is to treat and transform
notifications into meters. To do metering.

Now, if what you want is to archive all notifications and build meters
From that, there's a couple of solution, based on and around Ceilometer,
but I don't think Ceilometer is going to be enough.

For example, you could have a smaller project just listening to
notifications and storing them in a databse like StackTach does, and
move the metering part into Ceilometer.
Or you could write a driver notifier storing directly the notification
into a database actually, I guess that depends on what you want to

But Ceilometer itself has no use of the raw notificatins once it has
transformed them into meters.

> Sorry, I still trip over the ceilometer terminology. I was citing your
> comment above about "Ceilometer notification plugin" ... and the only
> one I was aware of was the one here:
> https://github.com/openstack/ceilometer/blob/master/ceilometer/compute/nova_notifier.py
> And, if so, I was saying that's the thing we don't really need.

Ah right, I get it. No, I was talking about plugin.NotificationBase,
which is the way you can handle notifications coming from Nova (or other
OpenStack components) in Ceilometer.
You can write a plugin using that (that will be used by
ceilometer-collector) to listen to (all) notifications and build any
meter. And even more complicated meter with transformers.

Julien Danjou
-- Free Software hacker & freelance
-- http://julien.danjou.info
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