Update index.md to describe leaving out the host in prometheus['listen_address']…

See merge request gitlab-org/gitlab-ce!18207

Direct upload of artifacts

See merge request gitlab-org/gitlab-ce!18160

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

Allow to store uploads by default on Object Storage

See merge request gitlab-org/gitlab-ce!18156

Introduce `direct_upload` option for `uploads` which is gonna set a default storage to Object Storage and use Unicorn to save data

Fix https://gitlab.com/gitlab-org/gitlab-ee/issues/4474

Conflicts:
	db/schema.rb
	ee/app/controllers/ee/admin/application_settings_controller.rb
	ee/app/helpers/ee/application_settings_helper.rb
	ee/app/models/ee/application_setting.rb
	ee/app/models/license.rb
	ee/app/views/layouts/service_desk.html.haml
	ee/app/views/notify/approved_merge_request_email.html.haml
	ee/app/views/notify/service_desk_new_note_email.text.erb
	ee/app/views/notify/service_desk_thank_you_email.text.erb
	ee/app/views/notify/unapproved_merge_request_email.html.haml
	ee/lib/ee/api/entities.rb
	ee/spec/controllers/admin/application_settings_controller_spec.rb
	ee/spec/models/application_setting_spec.rb
	ee/spec/requests/api/settings_spec.rb
	lib/api/settings.rb
	spec/mailers/previews/notify_preview.rb

Closes #20060

Redesign application settings to match project settings (part 4)

See merge request gitlab-org/gitlab-ce!18100

The Sidekiq exporter logs were mixing with the normal Sidekiq logs. In order
to support structured logging in Sidekiq, we either need to split this data
out or convert the exporter to produce structured logs. Since Sidekiq job
processing is fundamentally different information from Web server traffic,
it seems cleaner to move the metrics traffic into a separate file, where they
can be parsed by a different filter if needed.

Relates to #20060