gitlab-org--gitlab-foss/doc/development/maintenance_mode.md

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Internal workings of GitLab Maintenance Mode (PREMIUM SELF)

Where is Maintenance Mode enforced?

GitLab Maintenance Mode only blocks writes from HTTP and SSH requests at the application level in a few key places within the rails application. Search the codebase for maintenance_mode?.

The database itself is not in read-only mode (except in a Geo secondary site) and can be written by sources other than the ones blocked.