Big thanks to @fg2it who created a POC as
well as the build container that this work
is based on.

Adds constant description for units

* refactor: tracing service refactoring

* refactor: sqlstore to instance service

* refactor: sqlstore & registory priority

* refactor: sqlstore refactor wip

* sqlstore: progress on getting tests to work again

* sqlstore: progress on refactoring and getting tests working

* sqlstore: connection string fix

* fix: not sure why this test is not working and required changing expires

* fix: updated grafana-cli

Makes `km/h` constant with distances

legend: fixes Firefox/baron scroll bug

create annotation on non-editable dashboard

scroll: temporary fix for double scrollbar issue

Compensates for Firefox scrollbar calculation error in the baron framework.
Offsetwidth and clientwidth are used to find the width of the scrollbar. In
the legend these differ by 9px and cause the scroll div to grow by 9px for
every refresh. This fix compensates with a negative margin-right in that
case.

Fixes #11830

If #11939 is not merged in the patch release, then
this is a temporary fix for 5.1.3. It sets overflow to
hidden for larger screens and keeps the overflow set to
auto for mobiles and tablets.

Fixes #11937

backend plugins: expose meta field

Use babel and hot loader only in yarn start

Align queries to prometheus with the step

* origin/master: (21 commits)
  docs: removes notes about beeing introduced in 5.0
  lock caniuse-db version to resolve phantomjs rendering issue
  Update dashboard_permissions.md
  move database-specific code into dialects (#11884)
  refactor: tracing service refactoring (#11907)
  fix typo in getLdapAttrN (#11898)
  docs: update installation instructions targeting v5.1.2 stable
  changelog: add notes about closing #11862, #11656
  Fix dependencies on Node v10
  Update dashboard.md
  changelog: add notes about closing #10338
  Phantom render.js is incorrectly retrieving number of active panels (#11100)
  singlestat: render time of last point based on dashboard timezone (#11425)
  Fix for #10078: symbol "&" is not escaped (#10137)
  Add alpha color channel support for graph bars (#10956)
  interpolate 'field' again in Elasticsearch terms queries (#10026)
  Templating : return __empty__ value when all value return nothing to prevent elasticsearch syntaxe error (#9701)
  http_server: All files in public/build have now a huge max-age (#11536)
  fix: ldap unit test
  decrease length of auth_id column in user_auth table
  ...

* only increase interval by step if jitter happened
* shift both start and end
* simplified tests by using low epoch numbers

* moved babel rules for hot reloading into TS loader
* toggling use of babel via HOT variable (true with `yarn start`)
* overriding webpack output when HOT to fix asset paths in dashboard
 urls like http://localhost:3333/d/...

resolve phantomjs rendering in production build

For some reason a newer version of this sub-dependency makes phantomjs
rendering unable to generate and save a png image, however without
any error message logged

docs: update dashboard_permissions.md

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