GitLab upgrade notes

Upgrade notes for supported GitLab versions. For upgrade notes for older versions, see the GitLab documentation archives.

• GitLab 19 upgrade notes
• GitLab 18 upgrade notes
• GitLab 17 upgrade notes
• GitLab 16 upgrade notes
• GitLab 15 upgrade notes

For the latest release notes, see the GitLab blog or review the changelog file.