GitLab

Fixes gitlab-org/gitlab-ce#42595

Same as `branded_login_page.md`

End-to-end testing example

See merge request gitlab-org/gitlab-ce!18959

For the sake of consistency, removes any extraneous
consecutive blank lines from the doc suite.

- Breaks up into more sections.
- Also minor fixes to pages within sections.

This helped me troubleshoot
https://gitlab.com/gitlab-org/gitlab-ee/issues/9727#note_141202527.

Add a line to say that event:read and project:read are required.
project:read is not strictly required right now, but will be when
the project dropdown is released next month.

This reverts merge request !25173

Make danger pick reviewers and maintainers at random, for feontend,
backend, database, etc, changes, whenever files belonging to those
teams get changed.

- Add link to Event tracking in FE guides

By setting expectations both the contributor and reviewer have more
certainty on what gets reviewed when, and at what speed changes could be
merged.

Extend the list of supported protocols to include FTP.

`queue_duration` is a useful metric that is currently in api_json.log
but not in production_json.log. We should add it because it tells us how
long the request sat in Workhorse before Unicorn processed it. Having
this field enables the support team to better troubleshoot when delays
began to happen.

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