Some users upgrading Mattermost using GitLab omnibus automation are surprised that gitlab.rb overwrites Mattermost setting, e.g. https://gitlab.com/gitlab-org/omnibus-gitlab/issues/1568#note_15134292
The GitLab Mattermost admin guide mentions this, but it's not prominent.
Wondering if someone from the GitLab Mattermost community could help update the guide to make things more clear--ideally someone who knows how GitLab admins think and where best to place the information so it'll be noticed.
A merge request can be opened directly on the documentation: https://gitlab.com/gitlab-org/omnibus-gitlab/blob/master/doc//gitlab-mattermost/README.md