Revert "Merge pull request #7349 from srna/patch-1"

This reverts commit b37b71d887e8521b8992aa6e4f789a38b393e55a, reversing
changes made to 42a1d8083c77d3803320bbbd0ac1559ff32d2519.
Add an avatar_url spec when relative url is set.
Wait 15 minutes before Sidekiq MemoryKiller action
Move sidekiq debug docs to development folder
Merge branch 'attachment_url_shouldnot_be_overwritten' into 'master'

Attachment url should not be overwritten

Fixes #1786

See merge request !1308
Drop vagrant preference in issue tracker guidelines.
Merge pull request #8436 from Razer6/move_doc_to_folder

Move sidekiq debug docs to development folder
Use constants instead of getters
Merge branch 'tracker_guidelines' into 'master'

Drop vagrant from issue tracker guidelines

Is this the preferred method of reproducing an issue? If yes, disregard this MR.

\cc @sytses @marin

See merge request !255
Fix typo
Use the new SIDEKIQ_MEMORY_KILLER_MAX_RSS variable
advise about unicorn workers
speed up migration to identities
Merge branch 'sidekiq_memory_killer_grace_time' into 'master'

Add 'grace time' behavior to Sidekiq MemoryKiller

The previous iteration of the memory killer did not give 'large'
jobs much of a chance to finish. This caused them to come back after
each restart, leading to another memory-induced shutdown. By adding
some 'grace time' between the moment we detect a memory peak and
the moment we start shutting down, we hope to give Sidekiq a chance
to get whatever causes its memory to grow 'out of its system'.

See merge request !1313
memory constrained unicorn workers
Merge branch 'unicorn-advice' into 'master'

Unicorn advice

See merge request !1314
Consolidate unicorn worker advise.
Merge branch 'unicorn-workers' into 'master'

Unicorn workers

See merge request !1316
Merge branch 'speed_up_migration' into 'master'

Speed up omniauth AddIdentityTable migration

https://dev.gitlab.org/gitlab/gitlabhq/issues/1810

See merge request !1315
Merge branch 'master' of github.com:gitlabhq/gitlabhq