Suggestion for update https://gitlab.com/help/update/upgrader.md
When i update my gitlab ci from 7.9.3 to 8.3.2 using https://gitlab.com/help/update/upgrader.md, all the steps was success.
After i restart gitlab nginx service and login,the css style and page was error.
Then i take some time to fix the problem.At last,i regenerate the asset and fix the problem with command
sudo -u git -H bundle exec rake assets:clean assets:precompile cache:clear RAILS_ENV=production
So i think you can update the document in https://gitlab.com/help/update/upgrader.md.
PS. forgive my poor English.