As I mentioned the last time you asked :), we use blueprints, and the template 
is here: https://blueprints.launchpad.net/horizon/+spec/template

Please register a blueprint for discussion / tracking. The change looks 
sensible, although I’d prefer we use a setting name like 
https://docs.openstack.org/horizon/latest/configuration/settings.html#openstack-keystone-domain-choices.
 It’s a bit less ambiguous.

Rob



On 16 Aug 2017, at 23:03, Lingxian Kong 
<anlin.k...@gmail.com<mailto:anlin.k...@gmail.com>> wrote:

Hi, Horizon developers,

In our OpenStack based public cloud(Catalyst Cloud), Keystone is a shared 
identity service across 3 regions, our customers have been asking for the 
feature that they could select their preferred region when they log in Horizon, 
rather than switching region each time after login.

Unfortunately, the existing 'AVAILABLE_REGIONS' only works with multi-keystone, 
multi-region environment, so for backward compatibility and getting rid of 
potential confusion, a new config option named 'AVAILABLE_SERVICE_REGIONS' was 
introduced in my patch[1][2], the setting is supposed to be configured by the 
cloud operators and the 'AVAILABLE_REGIONS' setting will take precedence over 
'AVAILABLE_SERVICE_REGIONS'.

I am sending this email to ask for more feedback, and do I need to propose a 
feature spec before the code is actually being reviewed?

[1]: https://review.openstack.org/#/c/494083/
[2]: https://review.openstack.org/#/c/494059/

Cheers,
Lingxian Kong (Larry)
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