[Backend] Merge 'master' changes into the backend (#875)

* CI: fix shellcheck issues (#789)

Signed-off-by: Mario Trangoni <mjtrangoni@gmail.com>

* annotations: fix options in grafana 6.x, fix #813

* fix function editor in Grafana 6.4, closes #810

* add typings for grafana packages

* Add $__range_series variable for calculating function over the whole series, #531

* fix tests

* Don't set alert styles for react panels, fix #823

* docs: add range variables

* docs: percentile reference

* fix codespell

* update packages (build with node 12)

* update circleci node image to 12

* fix test configuration (babel)

* Fix 817 (#851)

* problems: update panel schema

* update packages (build with node 12)

* problems: use datasource from target

* problems: fix query editor after schema update

* problems: fix list layout

* update circleci node image to 12

* fix tests

* build(deps-dev): bump lodash from 4.17.10 to 4.17.13 (#852)

Bumps [lodash](https://github.com/lodash/lodash) from 4.17.10 to 4.17.13.
- [Release notes](https://github.com/lodash/lodash/releases)
- [Commits](https://github.com/lodash/lodash/compare/4.17.10...4.17.13)

Signed-off-by: dependabot[bot] <support@github.com>

* fix packages security alerts

* problems: fix tags adding and removal

* fix adding func from typeahead, closes #468

* update change log

* bump plugin version to 3.10.5

* problems: fix tag removal (list layout)

* Fix percentile() function, closes #862 (#863)

Like the other aggregation functions, the datapoints need to be sorted in
time before calling groupBy_perf().

* Update copyright, happy New Year!

* fix not acknowledged problem color with a message (#858)

* fix not acknowledged problem color with a message

* fix not acknowledged problem color with a message, closes #857

* Variable query editor (#856)

* refactor: convert module to typescript

* refactor: covert utils to typescript

* variable query editor WIP

* variable editor: fix type error after grafana/ui update

* variable editor: use FormLabel from grafana/ui

* variable editor: refactor

* variable editor: input validation and highlights

* variable editor: fix tests

* variable query: fix backward compatibility with empty queries

* fix linter errors

* variable editor: fix variable replacement in queries

* Fixes for backend

Co-authored-by: Mario Trangoni <mario@mariotrangoni.de>
Co-authored-by: Alexander Zobnin <alexanderzobnin@gmail.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Mark Reibert <mreibert@netskope.com>
Co-authored-by: memfiz <arnis.civciss@gmail.com>

src/panel-triggers/types.ts

@@ -1,7 +1,7 @@
 export interface ProblemsPanelOptions {
   schemaVersion: number;
   datasources: any[];
-  targets: Map<string, ProblemsPanelTarget>;
+  targets: ProblemsPanelTarget[];
   // Fields
   hostField?: boolean;
   hostTechNameField?: boolean;
@@ -62,6 +62,7 @@ export interface ProblemsPanelTarget {
   proxy: {
     filter: string
   };
+  datasource: string;
 }
 
 export interface TriggerSeverity {
@@ -192,7 +193,7 @@ export interface RTRow<T> {
   /** true if this row was produced by a pivot */
   groupedByPivot?: boolean;
   /** any sub rows defined by the `subRowKey` prop */
-  subRows?: boolean;
+  subRows?: any[];
 }
 
 export interface RTCell<T> extends RTRow<T> {