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Hi Ifat,

what way do you want to use the alarm change notifications? using events 
from Ceilometer API or directly collecting the notifications from 
message bus?
if we configure Ceilometer to listen the notifications from aodh, the 
notifications about alarm changes will be converted to events and stored 
in Ceilometer storage. if you want to use the events about alarm 
changes, the same info can be queried by "alarm-history" API, may be you 
want to do aggregation on events data ?

Thanks
Liu sheng

在 2016/1/5 21:37, AFEK, Ifat (Ifat) 写道:
>> -----Original Message-----
>> From: gord chung [mailto:gord at live.ca]
>> Sent: Friday, December 11, 2015 10:17 PM
>>
>> the original reason this was implemented i believe was to track alarm
>> state changes as an event in ceilometer events. i still see this as a
>> valid use case but it does duplicate some of the functionality of alarm
>> history.
>>
>> i think the main items are to not flood the message bus with messages
>> that no one is listening to. but if there is a use case for it, i'm
>> happy to see it remain (and improved).
>>
>> you can check the patch that Liusheng referenced, but the basic concept
>> is as mentioned: send message when an alarm state is changed.
>>
> Hi Gord,
>
> We had some further discussions about this issue in Vitrage team, and we decided we do want to use Aodh notifications about alarm state changes.
>
> One reason is that we want to be notified about every alarm, yet we don't want to register our web-hook on each alarm definition separately. The other reason is that we already listen to message bus notifications of other openstack components (like nova), and we would like to handle aodh notifications the same way we handle all other openstack notifications.
>
> We will be happy if this code remains.
>
> Thanks,
> Ifat.
>
>
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