Open Stack

Howdy,

So I'm wondering if we can optimise our resource usage by limiting when 
we run rechecks a little tighter. A recent change[0] removed the need 
for supplying 'no bug' or 'bug #' as it was decided these were 
unnecessary. However we are now triggering rechecks on 'recheck*' which 
means when somebody wants to recheck a third party they will also be 
wasting OpenStack's resources (eg 'recheck migrations' will trigger both 
turbo-hipster and jenkins).

There is also the case where we might want to recheck Jenkins and not a 
third party. Most 1st and 3rd party systems both currently trigger on 
'recheck no bug' for legacy reasons but it is wasting both 3rd and 1st 
party resources. Basically we need a way of rechecking only the failing 
system or the system the commenter is concerned with.

I'd like to propose that OpenStack's CI triggers on the following comments:

recheck no bug
recheck bug #
recheck openstack-ci
recheck jenkins
recheck all

The first two would be there for legacy matching while we re-train users 
to use the latter. The thought process here is that once we figure out 
the naming of CI systems we can just use 'recheck system-name' and save 
on resources by not rechecking everything all the time. Rechecking based 
on the username commenting on the system is a usability thing in my 
mind. This should make it obvious to developers how to target their 
rechecks.

Thoughts?

Cheers,
Josh

[0] https://review.openstack.org/#/c/108724/

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