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For multi-node deployments, implementing something like inotify would allow administrators to push configuration changes out to multiple targets using puppet/chef/etc. and have the daemons pick it up without restart. Thumbs up to that.

As Tim Bell suggested, API-based enabling/disabling would allow users to update meters via script, but then there's the question of how to work out the global vs. per-project tenant settings...right now we collect specified meters for all available projects, and the API returns whatever data is stored minus filtered values. Maybe I'm missing something in the suggestion, but turning off collection for an individual project seems like it'd require some deep changes.

Vijay, I'll repeat dhellmann's request: do you have more detail in another doc? :-)

-	Phil

> -----Original Message-----
> From: Kodam, Vijayakumar (EXT-Tata Consultancy Ser - FI/Espoo)
> [mailto:vijayakumar.kodam.ext at nsn.com]
> Sent: Tuesday, January 07, 2014 2:49 AM
> To: OpenStack Development Mailing List (not for usage questions)
> Cc: chmouel at enovance.com
> Subject: Re: [openstack-dev] [Ceilometer] Dynamic Meters in Ceilometer
> From: ext Chmouel Boudjnah [mailto:chmouel at enovance.com]
> Sent: Monday, January 06, 2014 2:19 PM
> To: OpenStack Development Mailing List (not for usage questions)
> Subject: Re: [openstack-dev] [Ceilometer] Dynamic Meters in Ceilometer
> 
> 
> 
> 
> 
> On Mon, Jan 6, 2014 at 12:52 PM, Kodam, Vijayakumar (EXT-Tata Consultancy
> Ser - FI/Espoo) <vijayakumar.kodam.ext at nsn.com> wrote:
> 
> In this case, simply changing the meter properties in a configuration file
> should be enough. There should be an inotify signal which shall notify
> ceilometer of the changes in the config file. Then ceilometer should
> automatically update the meters without restarting.
> 
> 
> 
> Why it cannot be something configured by the admin with inotifywait(1)
> command?
> 
> 
> 
> Or this can be an API call for enabling/disabling meters which could be more
> useful without having to change the config files.
> 
> 
> 
> Chmouel.
> 
> 
> 
> I haven't tried inotifywait() in this implementation. I need to check if it will be
> useful for the current implementation.
> 
> Yes. API call could be more useful than changing the config files manually.
> 
> 
> 
> Thanks,
> 
> VijayKumar