While GitLab omnibus is set up to manage Mattermost via the gitlab.rb file and a custom layout of Mattermost files, some community members want more control by using the Mattermost CLI tool, which requires additional configuration steps because of the GitLab omnibus layout.
This request is to ask help from the community to make a merge request to document the additional steps in the GitLab Mattermost Admin Guide, which can be verified by the GitLab omnibus team and included in a future release.
There is a GitLab issue posted on this as well.