Add user cohorts table to admin area

Closes gitlab-ce#29551

See merge request !1545

Make deploy board be visible by default

Closes #2106

See merge request !1595

Merge remote-tracking branch 'origin/master' into update-trace-handling-code

See merge request !1580

Service desk usage ping

Closes #1706

See merge request !1588

removes the duplicate sum of lfs objects

Closes #2055

See merge request !1599

Service Desk FE updates v1

See merge request !1604

Remove wrong user email from CI variables example output

See merge request !1606

[ci skip]

Merge branch '27790-periodically-save-last-activity-date-data-from-redis-to-the-database-hscan' into 'master'

[Improved] Periodically save last activity date data from Redis to the database

See merge request !1597

Thanks @jschatz1 for the review

Signed-off-by: Rémy Coutable <remy@rymai.me>

Signed-off-by: Rémy Coutable <remy@rymai.me>

Signed-off-by: Rémy Coutable <remy@rymai.me>

This new class uses a Redis Hash instead of a Sorted Set.
Signed-off-by: Rémy Coutable <remy@rymai.me>

Fix the new elasticsearch sidekiq queue names

See merge request !1600

Thanks @smcgivern for the layout tips

Geo - Add support for remaining file replication

See merge request !1562

Protected Tags EE MR

See merge request !1572

Allow admins and auditors to perform global searches with Elasticsearch

Closes #1646

See merge request !1578

Feature/service desk be

See merge request !1508

# Conflicts:
#   spec/lib/gitlab/import_export/all_models.yml

Service desk integration

See merge request !1519

Give each elasticsearch worker its own sidekiq queue

Closes #2108

See merge request !1598