A lot of useful information about the tool can be found here:

000 - GitLab - where to look for the info
005 - PSNC GitLab - general information on how to use GitLab at PSNC

How to request Gitlab project?

PSNC GitLab - new project

How I can import repository?

PSNC GitLab - project migration

How to integrate your project with GitLab?

ACH GitLab Jira integration

GitLab - just boring codes?

Not only! Meet: