Add support for JSON logging for audit events

See merge request gitlab-org/gitlab-ce!22471

This will add audit_json.log that writes one line per audit event. For
example:

{
       "severity":"INFO",
       "time":"2018-10-17T17:38:22.523Z",
       "author_id":3,
       "entity_id":2,
       "entity_type":"Project",
       "change":"visibility",
       "from":"Private",
       "to":"Public",
       "author_name":"John Doe4",
       "target_id":2,
       "target_type":"Project",
       "target_details":"namespace2/project2"
}

Make app/assets/javascripts/jobs/components/job_app.vue prettier

See merge request gitlab-org/gitlab-ce!22463

Revised images in group docs to address gitlab-org/gitlab-ce#43422

Closes #43422

See merge request gitlab-org/gitlab-ce!22031

Fix param typo in Notes documentation

See merge request gitlab-org/gitlab-ce!22406

Should be `start_in` not `start_key`

See merge request gitlab-org/gitlab-ce!22422

Associate Rakefile with Ruby icon in diffs

Closes #52654

See merge request gitlab-org/gitlab-ce!22341

repository check doc: fix a broken link

See merge request gitlab-org/gitlab-ce!22444

Remove beta status on hashed storage and reference to production readiness review.

See merge request gitlab-org/gitlab-ce!22457

Update README ruby version 2.3->2.4

See merge request gitlab-org/gitlab-ce!22466

Use monotonic time in computing web hook execution time

Closes #52855

See merge request gitlab-org/gitlab-ce!22448

Fixes broken test in master for ci status bagde

Closes #52886

See merge request gitlab-org/gitlab-ce!22465

Multiple spring rake commands cause "NameError: uninitialized constant HamlLint::Linter"

Closes #52843

See merge request gitlab-org/gitlab-ce!22437

Remove broken link

See merge request gitlab-org/gitlab-ce!22284

Link to Nurtch doc site.

See merge request gitlab-org/gitlab-ce!22399

Rails5: fix deployment model spec

See merge request gitlab-org/gitlab-ce!22428

[QA] Fix resource API fabrication documentation

See merge request gitlab-org/gitlab-ce!22461

Split troubleshooting docs review apps in own section

See merge request gitlab-org/gitlab-ce!22462

The precedence of methods to fetch a product's attribute value was changed recently:

1. API response
2. Web UI block
3. Inheritance from the factory
4. Raise a `QA::Factory::Product::NoValueError` error otherwise

Docs: Documents "help and feedback" section and Disqus

See merge request gitlab-org/gitlab-ce!22455

Resolve "Re-arrange help-related user menu items into new Help menu"

Closes #50728

See merge request gitlab-org/gitlab-ce!22195

Show wiki empty state layout on wiki-only project overview page

Closes #48731

See merge request gitlab-org/gitlab-ce!22262

- Links to MRs that introduced them
- Explains how to omit them
- Follows https://gitlab.com/gitlab-com/gitlab-docs/merge_requests/341

Trim database changes MR template and require up-to-date description before sending an MR for review

See merge request gitlab-org/gitlab-ce!21021

[QA] Fix the 'clone using deploy key' tests

Closes gitlab-org/quality/nightly#26

See merge request gitlab-org/gitlab-ce!22445

QA: Add support for pushing and viewing files

See merge request gitlab-org/gitlab-ce!21911

change generating url functions for external url

See merge request gitlab-org/gitlab-ce!22389

When to create follow-up technical debt issues

See merge request gitlab-org/gitlab-ce!22384