PG statement timeouts in production

Summary

We had reports from Sentry of errors of the form "ActiveRecord::QueryCanceled: PG::QueryCanceled: ERROR: canceling statement due to statement timeout".

cc @deandre

Timeline

2019-07-22

• 12:25 UTC - engineer on-call begins investigating reports of web errors such as https://gitlab.com/gitlab-org/gitlab-ce/issues/64914 and https://gitlab.com/gitlab-org/gitlab-ce/issues/64916
• ...