We're preparing the upgrade to GitLab 10! Preview the new UI: http://cern.ch/go/8stB

Changing the logo on the overall page and email header

Navigate to the Admin area and go to the Appearance page.

Upload the custom logo (Header logo) in the section Navigation bar.

appearance

After saving the page, your GitLab navigation bar will contain the custom logo:

custom_brand_header

The GitLab pipeline emails will also have the custom logo:

custom_email_header