502 timeouts in creating merge requests
As reported by @markglenfletcher and @balameb in https://gitlab.com/gitlab-org/gitlab-ce/issues/13912#note_26319939, some users are experiencing 502 timeouts when creating merge requests in 9.0.
With the help of profile_url.rb, you can see that for the request @markglenfletcher linked, 92% of the time is spent just retrieving each patch:
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/10251 should help, but loading the JSON data may still time out in this case.