* 8-4-stable: (285 commits)
Add Changelog entry for build traces data integrity fix
Update doc_styleguide.md [ci skip]
Added hint that you can search users by name, username, or email.
Add changelog
Version 8.4.0.rc1
Randomize metrics sample intervals
Make the metrics sampler interval configurable
Don't automatically require awesome_print
Disable colorization if STDOUT is not a tty
Block the reported user before destroying the record
changes `$quote-gray` to `$secondary-text`
makes message plural for multiple MRs and removes from loop. Duh.
Prepare Installation and Update docs for 8.4 RC1
Mention channel/key bug in irkerd docs
Revert "Remove the `:coffee` and `:coffeescript` Haml filters"
gets merge request discussion working again
adds back in discussion.haml.html for issues commenting and closing/reopening properly.
removing last chunk of MR ajax changes, rest will be in another MR
reverting more MR ajax files, will appear in different commit
reverting MR ajax changes, which will be in a different MR
...
Attempting to use the /projects/:id API by specifying :id in
"namespace/project" format would always result in a 404 if the namespace
contained a dot.
The reason? From http://guides.rubyonrails.org/routing.html#specifying-constraints:
"By default the :id parameter doesn't accept dots - this is because the dot is
used as a separator for formatted routes. If you need to use a dot within an
:id add a constraint which overrides this - for example id: /[^\/]+/ allows
anything except a slash."
Closes https://github.com/gitlabhq/gitlabhq/issues/9573
Add JS validation for invalid characters in branch name
Fixes#3293
Demo:

See merge request !2122
* add note to Events API
* add author section to Events API
* add noteable_id and noteable_type to Notes API
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>
Implement Build Artifacts
This implements #3028
1. It stores artifacts in shared/artifacts,
1. It adds `artifacts` to `.gitlab-ci.yml`,
1. We use GitLab Workhorse to offload artifacts uploading,
1. To download artifacts it uses GitLab Workhorse X-Sendfile extension,
1. There's one "artifact" per-build. The new upload removes previous one and creates a new one,
1. Default max artifact size is set to 100MB - this can be changed in settings.
Missing things:
1. Support for `.gitlab-ci.yml`: `artifacts: true or git-ls-files` which will upload all non tracked files,
1. Artifacts passing between builds.
GitLab Workhorse changes: https://gitlab.com/gitlab-org/gitlab-workhorse/merge_requests/5
GitLab Runner changes: https://gitlab.com/gitlab-org/gitlab-ci-multi-runner/merge_requests/46
Syntax:
```
artifacts:
untracked: true # default: false
paths: # default: empty
- bin/files
```
See merge request !1584