* DatasourceEditor: Add UI to edit custom HTTP headers

Support for custom headers was added in #11643 but was missing in the UI.

Fixes #12779

* Review

* Layout updates

Co-authored-by: Dominik Prokop <dominik.prokop@grafana.com>

* Datasource: Show access (Browser/Server) select on the Prometheus datasource configuration editor

* Trigger build

Fix typo in templating JSON

One has to use "grafana/grafana" image - only using "grafana" will
result in an error message like this:
Error response from daemon: pull access denied for grafana, repository does not exist or may require 'docker login'

It's a good idea to daemonize new container. The install instructions
for Docker do this, and this instructions assume that running container
already is daemonized (otherwise you wouldn't have to stop it).

Best practise would be to create a new container, then stop old one and
start new one - this would reduce downtime. To keep instructions simple
and understandable, I didn't include that.

* Add new global built-in variables #20523
new branch from master

* #20523 Revert change on __from and __to like requested

* #20523 simplify contextSrv access

* #20523 simplify contextSrv access

* #20523 repair jest tests

* reimplement hidefromtabs

* remove console log

* going with option b instead

* less explicit

Implements initial support for resources using v0.14.0 of SDK.

Ref #21512

This is to make the custom dockerfiles compatible with our instruction
to use persitent volumes for the /var/lib/grafana dir. Without this
change the contents of that folder will be overshadowed by the persitent
volume and none of the pre-installed plugins will be available.

Image Rendering: Fix render of graph panel legend aligned to the right using Grafana image renderer plugin/service (#21854)

Don't render class body--phantomjs on body element when 
PhantomJS renderer not is in use.

Fixes #21830

* Applied prettier to relevant webpack configs

* Replaced ng-annotate with babel-plugin-angularjs-annotate

… and replaced ts-loader with @preset/typescript

* Removed redundant import

… that is problematic with Babel's module resolver

* Updated lockfile

* Traspile debug package to es5 for PhantomJS support

* Update babel to latest version

* Remove @babel/poolyfill and url search params polyfill

* Add ts-loader to grafana-ui dependencies

* Update prod webpack build to use cor-js 3

* Applied prettier to relevant webpack configs

* Replaced ng-annotate with babel-plugin-angularjs-annotate

… and replaced ts-loader with @preset/typescript

* Updated lockfile

Co-authored-by: Dominik Prokop <dominik.prokop@grafana.com>

* Docs: Add information about license expiration

* Docs: Improve clarity of license expiration page

* review comments

* change renewal instructions to a list

* language improvements

* review fixes

Graphite: Fixed issue with functions with multiple required params and no defaults caused params that could not be edited (groupByNodes groupByTags) (#21814)

* Graphite: Fixed issue functions with multiple required params and no defaults

* removed some prev changes

* Update public/app/plugins/datasource/graphite/func_editor.ts

Co-authored-by: Dominik Prokop <dominik.prokop@grafana.com>

* Timepicker class fixed

* Missed arrow in dashboard title

* Upgraded to latest stroybook.

* Upgraded to version 5.3.9

* updated yarn.lock file.

* Mak table panel with padding

* Make table have a correct height

StatPanels: Fixed migration from old singlestat and default min & max being copied even when gauge was disbled (#21820)

* Update docker.md

* Update configuration.md

* Update configuration.md

* Update configuration, docker, and add configure-docker

* Moe Docker updates

* Update docker.md

* deleted build custom docker image file and moved content

* Update docker.md

* Minor updates

Mostly grammar fixes

* Update docs/sources/installation/docker.md

Co-Authored-By: Marcus Efraimsson <marcus.efraimsson@gmail.com>

* Updated config-docker and configuration

Moved environment variables information back to configuration.md

* Update docs/sources/installation/configuration.md

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

* Update docs/sources/installation/configure-docker.md

Co-Authored-By: Marcus Efraimsson <marcus.efraimsson@gmail.com>

* Update docs/sources/installation/docker.md

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

* Update docs/sources/installation/docker.md

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

* Update docs/sources/installation/docker.md

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

* Applied edits

* Update _index.md

Co-authored-by: Marcus Efraimsson <marcus.efraimsson@gmail.com>
Co-authored-by: Leonard Gram <leo@xlson.com>

This alphabetizes names in the sidebar docs/features/DataSources and
also includes a fix in typo for the item "TestData".

* add error tab

* conditional tabs

* feedback from review

* expose lastResult via function

* remove todo and weird char

* fixing overflow states and height of tabcontent

* style fixes

* more changes to scroll handling

* fixing null checks

* Change drawer content padding

* Add scroll in the story

Co-authored-by: Dominik Prokop <dominik.prokop@grafana.com>