Previously the Analytics documentation index was built around the
Analytics Workspace concept. It did not sufficiently explain features
located outside the Workspace. Plus, we are moving away from the
Workspace concept anyway. This re-structures the Analytics
documentation index into 3 sections: instance (Workspace), group and
project levels. The Analytics features available are explained.

Merge branch '199422-maximum-size-for-gitlab-pages-says-to-set-it-to-0-for-unlimited-but-it-doesn-t-accept-a' into 'master'

Allow 0 for max_pages_size as infinity

See merge request gitlab-org/gitlab!28086

Fix streaming serializer for serialize_many_each

Closes #212607

See merge request gitlab-org/gitlab!28138

Quarantine additional QA test

See merge request gitlab-org/gitlab!28127

Make Rails.cache and Gitlab::Redis::Cache use the same pool

See merge request gitlab-org/gitlab!28074

Hide helm application row if local tiller

See merge request gitlab-org/gitlab!24742

- Bad merge, method name changed to write_relation_array

Fix Spring Loading Wrong Instrumentation Class

See merge request gitlab-org/gitlab!28051

Add support for project_members array

Closes #212457

See merge request gitlab-org/gitlab!28025

Use GlAlert component for design list load error

See merge request gitlab-org/gitlab!28079

Quarantine several manage QA tests

See merge request gitlab-org/gitlab!28117

Make sure the shards table has its index created before populating it

Closes #212436

See merge request gitlab-org/gitlab!28084

Refactor JSON reader/writer for import/export

See merge request gitlab-org/gitlab!27679

- adds `allowed_path` to strong validate `LegacyReader`
  and `LegacyWriter`
- does not change any of todays behaviour for data serialization
- makes the interface for reader and writer to accept
  `importable/exportable_path` that will be used by `ndjson`
  to store data in separate files
- moves consuming of attributes outside of the relation tree restorer
  to ease the way how we process them
- splits specs for `LegacyReader::User/File` and introduces
  shared example for that: this is also the majority of changes
  introduced by this MR in order to move them
- slightly code-formats and re-organises group and project
  import/export

Return error message in custom metric validation when prometheus URL is blocked

See merge request gitlab-org/gitlab!27863

Fix optional params for deploy token API

Closes #211878

See merge request gitlab-org/gitlab!27961

Unified views for Project and Personal snippets

See merge request gitlab-org/gitlab!27998

Document how to delete images from the Container Registry

Closes #32669

See merge request gitlab-org/gitlab!27622

Document the various ways of deleting images from the Container
Registry.

Replace set to let_it_be in spec

See merge request gitlab-org/gitlab!28004

Merge branch '208433-follow-up-from-add-mutation-concern-to-resolve-a-single-issuable-part-2' into 'master'

Use ResolvesIssuable for Epics

Closes #208433

See merge request gitlab-org/gitlab!27903

Use 'license_scanning' in controller tests

See merge request gitlab-org/gitlab!27819

Fixes the file row icons hiding when the shouldn't be

See merge request gitlab-org/gitlab!28110

Log member additions when importing Project/Group

See merge request gitlab-org/gitlab!27930

Use prefix search instead of ngrams for sha fields

See merge request gitlab-org/gitlab!27597

Currently, SHAs are indexed using ngrams from 5 to 40 characters. This
means that each SHA is split into 35 separate terms taking up a lot of
storage. SHAs are quite unique from 4-5 characters on, so a simple
prefix search will be sufficiently fast and as effective as ngrams with
term matching. This change replaces current sha fields analyzers with
prefix search.

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

Improve Group Security Dashboard performance

See merge request gitlab-org/gitlab!27959

Add feature flag to highest role callback

See merge request gitlab-org/gitlab!28105

Docs: Create MR from a fork

Closes #199227

See merge request gitlab-org/gitlab!28111

Docs add packages url to updates

See merge request gitlab-org/gitlab!27762

Remove forward npm package request feature flag

See merge request gitlab-org/gitlab!27987

Updated text to stress importance of the requirements

See merge request gitlab-org/gitlab!27027

Add language around Cloudflare IPs

See merge request gitlab-org/gitlab!28010

See https://about.gitlab.com/blog/2020/01/16/gitlab-changes-to-cloudflare/ for details.