gitlabhq/doc/update/README.md

• The individual version update guides
• The CE to EE update guides (subscribers only) the steps are very similar to a version upgrade: stop the server, get the code, update config files for the new functionality, install libs and do migrations, update the init script, start the application and check the application status.
• Upgrader automatic script to perform the update
• Patch versions
• MySQL to PostgreSQL
• Omnibus update guide