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Introduce one additional thread into bin/elastic_repo_indexer

See merge request !1372

Resolve "Custom hook errors don't display in merge request widget"

Closes #1852

See merge request !1375

Multiple issue boards milestone

Closes #1587 and #1156

See merge request !1150

API routes referencing a specific issue should use the issue `iid`

See merge request !1325

Merge branch '26732-combine-deploy-keys-and-push-rules-and-mirror-repository-and-protect-branches-settings-pages-ee' into 'master'

Port of 26732-combine-deploy-keys-and-push-rules-and-mirror-repository-and-prote…

See merge request !1167

[EE] Prometheus monitoring

See merge request !1374

Remove unnecessary Vue usage

See merge request !1363

Also fixed naming of a test in the deploy_keys_presenter

Used collection on the deploy_keys/_index.html partial render calls,
also added delegate methods on the deploy_keys_presenter.rb

Fixed the repository_controller_spec.rb

Added specs for the deploy_keys_presenter and added a new method in the presenter
called #key_available?

Fixed some minor UX inconsistencies and added a concern to handle
redirection

Also removed redundant code

Fixed the repository_helper not using instance variables, also
added the repository shorcut handler inside the dispatcher

Also fixed the access_level_dropdown not pointing in the right direction

Port of 26732-combine-deploy-keys-and-push-rules-and-mirror-repository-and-protect-branches-settings-pages to EE

Resolve "Elasticsearch project indexing fails on bad data"

Closes #1840

See merge request !1365

CE upstream

See merge request !1360

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

# Conflicts:
#   app/helpers/preferences_helper.rb

Port of remove-readme-option to EE

See merge request !1368

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

# Conflicts:
#   app/policies/group_policy.rb

Native Unicode Emojis - EE merge edition

See merge request !1369

Backport "Simplify project payload exposed on Environment endpoints in V4"

See merge request !1345