* master: (108 commits)
  Fix project transfer e-mail sending incorrect paths in e-mail notification
  Update CHANGELOG
  Use Gitlab::CurrentSettings for InfluxDB
  Write to InfluxDB directly via UDP
  Strip newlines from obfuscated SQL
  Add hotfix that allows to access build artifacts created before 8.3
  note votes methids implementation
  When reCAPTCHA is disabled, allow registrations to go through without a code
  Downcased user or email search for avatar_icon.
  Handle missing settings table for metrics
  Fix broken link in permissions page [ci skip]
  reCAPTCHA is configurable through Admin Settings, no reload needed.
  Fixed syntax in gitlab.yml.example
  Move InfluxDB settings to ApplicationSetting
  Fix spelling mistake, thanks Connor.
  Restart settings are moved too.
  Hotfix for builds trace data integrity
  add issue weight to contributing
  Added host option for InfluxDB
  Fixed styling of MetricsWorker specs
  ...

Hotfix for builds trace data integrity

Closes #4246

See merge request !2224

Fixes problem with user autocomplete URI 

```
Failed to load resource: net::ERR_NAME_NOT_RESOLVED
http://autocomplete/users.json?search=&per_page=20&active=true&current_user=false
```

Fixes #4118, #4136

See merge request !2136

Fix project transfer e-mail sending incorrect paths in e-mail notification

The introduction of ActiveJob and `deliver_now` in 7f214cee caused a race
condition where the mailer would be invoked before the project was committed
to the database, causing the transfer e-mail notification to show the old
path instead of the new one.

Closes #4670

See merge request !2235

The introduction of ActiveJob and `deliver_now` in 7f214cee caused a race
condition where the mailer would be invoked before the project was committed
to the database, causing the transfer e-mail notification to show the old
path instead of the new one.

Closes #4670

[ci skip]

Revert upvotes and downvotes params back to MR API

issue https://gitlab.com/gitlab-org/gitlab-ce/issues/3672

See merge request !2212

See merge request !2239

This ensures we can still start up even when not connecting to a
database.

See merge request !2238

This removes the need for Sidekiq and any overhead/problems introduced
by TCP. There are a few things to take into account:

1. When writing data to InfluxDB you may still get an error if the
   server becomes unavailable during the write. Because of this we're
   catching all exceptions and just ignore them (for now).
2. Writing via UDP apparently requires the timestamp to be in
   nanoseconds. Without this data either isn't written properly.
3. Due to the restrictions on UDP buffer sizes we're writing metrics one
   by one, instead of writing all of them at once.

Newlines aren't really needed and they may mess with InfluxDB's line
protocol.

Downcased user or email search for avatar_icon.

GitLab users are defined with their mail address which is enforced to be lower case. When a commit is listed in the history whose committer mail address is not written in all lower case, the corresponding GitLab user won't be found because the search is case sensitive resp. the mail address to search for not downcased.

Closes #3780 

See merge request !2234

Makes reCAPTCHA configurable through Application Settings screen

Following the work made by @stanhu here: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/2216, made it configurable without needing to restart Gitlab

See merge request !2231

This is a temporary hotfix that allows to access build artifacts created
before 8.3. See #5257.

This needs to be changed after migrating CI build files.

Note that `ArtifactUploader` uses `artifacts_path` to create a storage
directory before and after parsisting `Ci::Build` instance, before and
after moving a file to store (save and fetch a file).

Fix spelling mistake, thanks Connor.

[ci skip]

See merge request !2227

Signed-off-by: Rubén Dávila <rdavila84@gmail.com>

Handle missing settings table for metrics



See merge request !2232

Fix broken link in permissions page



See merge request !2233

This ensures we can still boot, even when the "application_settings"
table doesn't exist.

Move InfluxDB settings to ApplicationSetting

This moves the settings from the YAML files to the database.

cc @sytses

See merge request !2228

Fixed syntax in gitlab.yml.example



See merge request !2230

Restart settings are moved too.



See merge request !2226

Issue #4246