Mattermost (Slack-alternative) service established


Mattermost, an open source self-hosted alternative to Slack has been set up at PIK. This service is closely integrated with GitLab and thus requires you to log in via your GitLab (PIK) credentials.

The user guide can be found here:

Mattermost can be used to receive GitLab project notifications. The (per-project) setup is described here:

Mattermost client applications for Android and Apple are also available (see

If you encounter any bugs or other unexpected behaviour, or have any specific usage questions not covered in the user guide please file a ticket with