GitLab Mattermost (deprecated)

<!-- markdownlint-disable -->

Mattermost bundled with the Linux package was deprecated in GitLab 18.9 and removed in GitLab 19.0.

To migrate your bundled Mattermost to a standalone deployment, see Migrating from the bundled Mattermost to Mattermost Standalone in the Mattermost documentation.

<!-- This redirect file can be deleted after <2027-06-05>. --> <!-- Redirects that point to other docs in the same project expire in three months. --> <!-- Redirects that point to docs in a different project or site (for example, link is not relative and starts with `https:`) expire in one year. --> <!-- Before deletion, see: https://docs.gitlab.com/development/documentation/redirects -->