I believe it is better to mention combined version of tags to clarify the intended usage.
Even if a project specific topic, both [dev] and [ops] topics are possible.
For nova development, do we use [dev] [nova] or simply [nova]?
Some guidance would help subscribers.

Thanks,
Akihiro

2018年11月21日(水) 17:40 Thierry Carrez <thierry@openstack.org>:
Hi openstack-discuss,

As part of the ML merge, we introduced a number of subject prefixes to
help subscribers filter discussions. The most important ones are to use:

[dev] For discussions that are purely development-oriented
[ops] For discussions that are purely operations-oriented

Of course (as we have realized with the amount of cross-posted topics),
most discussions benefit from input from all our contributors, whether
they come from an development or an operational background. For those,
there is no need to apply [dev] and/or [ops] prefixes, just try to be
informative by adding the project name, team name or other information
instead.

You can ping specific populations by adding:

[tc] Discussions of interest for TC members
[uc] Discussions of interest for UC members
[ptl] Discussions of interest for all PTLs
[release] Release team, release liaisons and PTLs

You can also specifically use (with care):

[all] For discussions that should really be of interest to EVERYONE

See (and add!) other common subject prefixes at:
https://etherpad.openstack.org/p/common-openstack-ml-topics

Thanks for your help in making this common list more navigable.

--
Thierry Carrez (ttx)