GroupBy: add new groupby variable type and optional groupByKeys (#81717)

* add new groupby type

* rename to groupByKeys + introduce GroupByVariableModel

* fix unit test

* update scenes package

* update interface

* update fixture

* update unit test

* bump to scenes 2.6.2

* remove baseFilters for now

packages/grafana-data/src/types/datasource.ts

@@ -560,6 +560,7 @@ export interface DataQueryRequest<TQuery extends DataQuery = DataQuery> {
 
   /** Filters to dynamically apply to all queries */
   filters?: AdHocVariableFilter[];
+  groupByKeys?: string[];
 
   // Request Timing
   startTime: number;

packages/grafana-data/src/types/templateVars.ts

@@ -1,4 +1,5 @@
 import { LoadingState } from './data';
+import { MetricFindValue } from './datasource';
 import { DataSourceRef } from './query';
 
 export type VariableType = TypedVariableModel['type'];
@@ -13,6 +14,7 @@ export interface VariableModel {
 export type TypedVariableModel =
   | QueryVariableModel
   | AdHocVariableModel
+  | GroupByVariableModel
   | ConstantVariableModel
   | DataSourceVariableModel
   | IntervalVariableModel
@@ -64,6 +66,14 @@ export interface AdHocVariableModel extends BaseVariableModel {
   baseFilters?: AdHocVariableFilter[];
 }
 
+export interface GroupByVariableModel extends BaseVariableModel {
+  type: 'groupby';
+  datasource: DataSourceRef | null;
+  groupByKeys: string[];
+  defaultOptions?: MetricFindValue[];
+  multi: true;
+}
+
 export interface VariableOption {
   selected: boolean;
   text: string | string[];