Adds missing configuration documentation of the different 
log formats; console, file and syslog.

Ref #21765

* Chore: Removes strict null checks in ReducerTester

* Chore: Fixes strict null errors in ConfigureStore

* Chore: Fixes strict null errors in reducer tests

* Chore: Fixes strict null errors in reducers tests

* Chore: Fixes strict null errors in reducers tests

* Chore: Fixes strict null errors in toggleLogActionsMiddleware

* Chore: Fixes strict null errors in navModelReducer

* Core: Fixes strict null errors in public/app/features/admin/state

* Chore: Fixes strict null errors in public/app/features/dashboard/state/reducers.test.ts

* Chore: Fixes strict null errors in public/app/features/explore/state/reducers.test.ts

* Chore: Fixes strict null errors in public/app/features/datasources/state/reducers.test.ts

* Chore: Fixes strict null errors in public/e2e-test/scenarios/templating/templatevariables-crud.test.ts

* Chore: Fixes strict null errors in public/app/features/dashboard/containers/DashboardPage.test.tsx

* Update imports

* Solve compability issues with react-select

* Fix frozen lockfile

* Update snapshots

* Change name to something less general

* Fix proposed changes

* Fix imports

* Fix changes

Closes #21695

* Docs: Adds backendSrv notice

* Update CHANGELOG.md

Co-Authored-By: Leonard Gram <leo@xlson.com>

* Docs: Updates notice placement

* Changelog: v6.6.0

Co-authored-by: Leonard Gram <leo@xlson.com>

This is a small documentation update for the situation that led to 
#19842 in the first place. It describes a procedure required to 
provide root certificates to the headless Chrome instance used 
by the Grafana image renderer plugin.

* Replace bash/json with http in http_api codeblocks

Since http is used elsewhere on the API docs and makes the
markdown rendering look different on the blocks that use bash/json

* Fix the annotations API link on 'Features'

- Noticed the Features/Dashboard Features/Annotations link pointing to
the HTTP API was linking itself instead of '../http_api/annotations.md'.
- Also add a link on Dashboard Export and Import to its HTTP API.

* Add missing links to features in API Index

Noticed there was 3 missing references in the API docs index.
- https://grafana.com/docs/grafana/latest/http_api/playlist
- https://grafana.com/docs/grafana/latest/http_api/datasource_permissions
- https://grafana.com/docs/grafana/latest/http_api/external_group_sync

Last two are Grafana Enterprise -only, so created a separate subsection
for them.

* Fixed issues with angular digest and new backendSrv.
* Fixed failing tests.

* APT and YUM repositories

* Add julie's fixes

* Fix links

* Docs: Adds backendSrv notice (#21752)

* Docs: Adds backendSrv notice

* Update docs/sources/guides/whats-new-in-v6-6.md

* Add links to installation notes

Co-authored-by: Hugo Häggmark <hugo.haggmark@gmail.com>
Co-authored-by: Dominik Prokop <dominik.prokop@grafana.com>

Co-authored-by: Torkel Ödegaard <torkel@grafana.com>

* BackendSrv: Fixes POST body for form data
Fixes #21688

* Tests: Changes to POST examples

* Add info about meta data labels

* Add part about auto period calculations in cloudwatch

* Minor adjustments

* Updates after feedback

* Add more context

* Clarify what a metadata label is

* BackendSrv: Adds status, headers, statusText, redirect, type and url back to response
Fixes #21662

* BackendSrv: Adds request object back to datasourceRequest response
Fixes #21662

* Fix timestamp formats and use uid to filter context rows

* Remove timestamps from tests

* Docs: gitlab team-sync documented correctly

* docs: initial docs for whitelabeling

* Docs: enterprise repositories

* Docs: rpm enterprise install

* Docs: re-structured the rpm install page to be more similar to the deb page

* Docs: responded to review feedback

* Docs: recommends the enterprise edition

* Update docs/sources/installation/debian.md

Fixes so that viewers don't see a link to teams in side menu when
editors_can_admin setting is enabled.

* CircleCI: Add workflow for building with grabpl

* make importDataSourcePlugin cancelable

* fix imported plugin assignment

* init datasource plugin to redux

* remove commented

* testDataSource to redux

* add err console log

* isTesting is never used

* tests, loadError type

* more tests, testingStatus obj

* Update what's new in 6.6

* Add upgrading and changelog sections

* Remove lines

* Update cookie management section

* Update Bar Gauge unfilled option

* Add missing dot

Fixes a broken link in the 6.6 upgrade notes.

Alerting: Support passing tags to Pagerduty and allow notification on specific event categories (#21335)

Add support for passing tags to Pagerduty and allow notification 
on specific event categories such as Class, Group and Component.

Ref #19912, #19913

Co-authored-by: Arve Knudsen <arve.knudsen@gmail.com>