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you can consider ceilometer database (and api) as an open-ended model 
designed to capture the full fidelity of a datapoint (something useful 
for auditing, post processing). alternatively, gnocchi is a strongly 
type model which captures only required data.

in the case of ceilometer -> gnocchi, the measurement data ceilometer 
collects is sent to gnocchi and mapped to specific resource types[1]. 
here we define all the resources and the metric mappings available. with 
regards to collectd, i'm just wondering what additional metrics are 
added and possibly any interesting metadata?

[1] 
https://github.com/openstack/ceilometer/blob/master/etc/ceilometer/gnocchi_resources.yaml

On 25/01/2016 9:21 AM, Foley, Emma L wrote:
> I'm not overly familiar with Gnocchi, so I can't answer that off the bat, but I would be looking for answers to the following questions:
> What changes need to be made to gnocchi to accommodate regular data from ceilometer?
> Is there anything additional in Gnocchi's data model that is not part of Ceilometer?
>
> Regards,
> Emma
>
>
> -----Original Message-----
> From: gord chung [mailto:gord at live.ca]
> Sent: Friday, January 22, 2016 2:41 PM
> To: openstack-dev at lists.openstack.org
> Subject: Re: [openstack-dev] [telemetry][ceilometer] New project: collectd-ceilometer-plugin
>
> nice! thanks Emma!
>
> i'm wondering if there's an additional metrics/resources we should add to gnocchi to accommodate the data?
>
> On 22/01/2016 6:11 AM, Foley, Emma L wrote:
>> Hi folks,
>>
>> A new plug-in for making collectd[1] stats available to Ceilometer [2] is ready for use.
>>
>> The collectd-ceilometer-plugin make system statistics from collectd available to Ceilometer.
>> These additional statistics make it easier to detect faults and identify performance bottlenecks (among other uses).
>>
>> Regards,
>> Emma
>>
>> [1] https://collectd.org/
>> [2] http://github.com/openstack/collectd-ceilometer-plugin
>>    
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> --
> gord
>
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-- 
gord