* Docker blocks: Add loki blocks for loki releases

- Loki did major API changes between 0.3 and 0.4
- Adding blocks to simplify Grafana datasource testing for different
versions
- keeing `loki` block pointing at loki master
- Run all versions in parallel:
```
./create_docker_compose.sh loki0.3 loki0.4 loki
```
- all versions have different hostnames and ports internally
- datasource url depends on version so you can set them up as separate
datasources:
  - master: http://localhost:3100/
  - 0.3.0: http://localhost:3103/
  - 0.4.0: http://localhost:3104/

* Add loki minor version datasources

Templating: Made default template variable query editor field a text area with dynamic automatic height (#20288)

* Fix: URL Encode Group IDs for external team sync

External Group IDs can have special characters. Encode them to make them
URL-safe.

* Datasource: fixes prometheus metrics query query field definition

* Fix query editor for panels

Update version to 6.6.

Adds a new setting disable_admin_user and when true the default 
admin user will not be created when Grafana starts for the first 
time (or no users exists in the system).

Closes #19038

* fixes according to feedback

* additions to config and docs

* metric tank meta

* add metric tank info

* fixed info box

* process meta

* attach metrictank meta to response

* remove extra logging

* response is now DataFrame

* Minor refactoring and renaming of the prop

* Graphite: minor fixes

* add dependencies to support oracle plugin in alpine

* fix typo

* add generated docker image for PR to artifacts to make testing easier

* update path to artifact

* debug path to artifact

* debug path to artifact

* debug path to artifact

* fix ld.so.cache conflict

* only add glibc-compat for x86_64 builds

* do not store docker image in artifacts

* fix missing fi

* add basic components

* adding onchange handler for Prom settings

* move options outside component

* reorder imports

* Add missing setting

* e2eTests: Adds cleanup of created datasource and dashboard

* Chore: Fixes Prettier error

* Tests: Updates snapshots

* Panel: fix the default value of thresholds cannot be modified in Gauge panel

* Panel: fix the default value of thresholds cannot be modified in Gauge panel

* AuthProxy: Can now login with auth proxy and get a login token

* added unit tests

* renamed setting and updated docs

* AuthProxy: minor tweak

* Fixed tests and namings

* spellfix

* fix

* remove unused setting, probably from merge conflict

* fix

* Build: Add /Dockerfile.ubuntu
* Build: Add packaging/docker/Dockerfile.ubuntu
* Build: Add grafana-docker-ubuntu-pr CircleCI job
* Build: Add CircleCI jobs for building master/release Ubuntu based Docker images

The arching goal of this commit is to enable single user
synchronisation with LDAP. Also, it included minor fixes of style,
error messages and minor bug fixing.

The changes are:

- bug: The `multildap` package has its own errors when the user is
  not found. We fixed the conditional branch on this error by asserting
on the `multildap` errors as opposed to the `ldap` one

- bug: The previous interface usage of `RevokeAllUserTokens` did not
  work as expected. This replaces the manual injection of the service by
leveraging the service injected as part of the `server` struct.

- chore: Better error messages around not finding the user in LDAP.

- fix: Enable the single sync button and disable it when we receive an
  error from LDAP. Please note, that you can enable it by dispatching
the error. This allows you to try again without having to reload the
page.

- fix: Move the sync info to the top, then move the sync button above
  that information and clearfix to have more harmony with the UI.

* Fix: Adds Explore menuitem to React Panels
Fixes #19865

* Refactor: Adds CMD|CTRL+click to Explore menu item

* Elasticsearch: Support rendering in logs panel

- add "Logs" metric query type so panels can inform the datasource that
the query is a logs query
- datasource modifies target when metric query type `logs` is detected
- then existing log result processeing paths are followed

* Fix failing test, number of agg types changed

* Notifications: Add alert_state to the kafka message Fixes #11401

* Renamed ttl config in code to be more consistent with behaviour
* Introduced new setting `sync_ttl` in .ini file
* Keeping the old setting `ldap_sync_ttl` in the .ini file as fallback and compatibility.

Provisioning of dashboards now always overwrite existing ones and does not look at the configuration `allowUiUpdates` anymore

* Adding grafana plugin version info

It was unclear if one can specify the plugin version to the environment variable. It is possible and works fine. Added it to the plugin information.

* Update typo docs/sources/installation/docker.md

* Applied all comments

Moved the information to make it more readable, fixed typos and added missing punctuation.

* Rewording and better example

More feedback, added example text. Did not manage to get newline for the example.

* added the missing space

* query mixed

* query mixed

* batch queries

* check that the values only have 3 rows at the *end* as well