While I think the idea has merit, it's going to be a tough thing to version. 
(I'm neck deep in the notifications right now making a major revision to 
StackTach)

We'd have to version the context, the instance state dictionary, the cpu info 
and the related payloads for each type of message since each component comes 
from different, already-existing, systems.  (as opposed to the notification 
being responsible for the entire payload itself)

Lots of ramifications.

-S



From: [email protected] 
[[email protected]] on behalf of 
Day, Phil [[email protected]]

Sent: Tuesday, October 09, 2012 2:07 PM
To: [email protected] ([email protected]) 
([email protected])
Subject: [Openstack] Versioning for notification messages

Hi Folks,
 
What do people think about adding a version number to the notification systems, 
so that consumers of notification messages are protected to some extent from 
changes in the message contents ?
 
For example, would it be enough to add a version number to the messages – or 
should we have the version number as part of the topic itself (so that the 
notification system can provide both a 1.0 and 1.1 feed), etc ?
 
Phil





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