500s when trying to create a merge request

Summary

I cannot create a merge request, neither from API (HTTP timeout) or from www (500).

Steps to reproduce

• https://gitlab.com/lab4life/physical-activity-exploration/merge_requests/new?utf8=%E2%9C%93&merge_request%5Bsource_project_id%5D=11102736&merge_request%5Bsource_branch%5D=values&merge_request%5Btarget_project_id%5D=11102736&merge_request%5Btarget_branch%5D=master
• https://gitlab.com/lab4life/physical-activity-exploration/commit/7e235f88ad59933296d9ad95ef59755892bba3e3

What is the current bug behavior?

Both of these pages have been displaying "Whoops, something went wrong on our end." for hours now.

(What actually happens)

Relevant logs and/or screenshots

Traceback (most recent call last):
  (...)
  File "/usr/local/lib/python3.7/site-packages/gitlab/exceptions.py", line 255, in wrapped_f
    return f(*args, **kwargs)
  File "/usr/local/lib/python3.7/site-packages/gitlab/mixins.py", line 204, in create
    **kwargs)
  File "/usr/local/lib/python3.7/site-packages/gitlab/__init__.py", line 629, in http_post
    post_data=post_data, files=files, **kwargs)
  File "/usr/local/lib/python3.7/site-packages/gitlab/__init__.py", line 498, in http_request
    result = self.session.send(prepped, timeout=timeout, **settings)
  File "/usr/local/lib/python3.7/site-packages/requests/sessions.py", line 646, in send
    r = adapter.send(request, **kwargs)
  File "/usr/local/lib/python3.7/site-packages/requests/adapters.py", line 529, in send
    raise ReadTimeout(e, request=request)
requests.exceptions.ReadTimeout: HTTPSConnectionPool(host='gitlab.com', port=443): Read timed out. (read timeout=20)

Output of checks

This bug happens on GitLab.com