Hi!

Due this bug: https://bugs.launchpad.net/horizon/+bug/1210540 and its fix 
proposal: https://review.openstack.org/#/c/62026, I would like to discuss the 
inclusion of Nova's exception messages in the Horizon's dashboard.
nova/compute/api.py functions throws exceptions with a translatable messages, 
and they are caught by  "handle" function in horizon/tables/actions.py. This 
function ignores the exception message and displays a general one.
The idea is to modify "handle" function to show the exception messages to the 
users. The advantage is to have a better idea of the failure reason without 
reviewing logs, helping the end users with the troubleshooting. On the other 
hand, the disadvantage is it may lead to information disclosure or not 
translatable messages (if functions sending the exception do not translate the 
messages).

Then, what is the best approach to resolved the bug?

Thanks!

Best Regards,
VerĂ³nica Musso

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