[Discover] Track adhoc data views usage (#144244)

## Summary

Closes #141090

This PR enabled metrics for adhoc data views usage in Discover.

Co-authored-by: Julia Rechkunova <julia.rechkunova@elastic.co>

src/plugins/discover/public/application/main/hooks/use_adhoc_data_views.ts

@@ -9,13 +9,15 @@
 import { useCallback, useEffect, useState } from 'react';
 import type { DataView, DataViewsContract } from '@kbn/data-views-plugin/public';
 import { SavedSearch } from '@kbn/saved-search-plugin/public';
+import { METRIC_TYPE } from '@kbn/analytics';
 import {
   UPDATE_FILTER_REFERENCES_ACTION,
   UPDATE_FILTER_REFERENCES_TRIGGER,
 } from '@kbn/unified-search-plugin/public';
 import { ActionExecutionContext } from '@kbn/ui-actions-plugin/public';
 import type { FilterManager } from '@kbn/data-plugin/public';
 import type { ToastsStart } from '@kbn/core-notifications-browser';
+import { ADHOC_DATA_VIEW_RENDER_EVENT } from '../../../constants';
 import { getUiActions } from '../../../kibana_services';
 import { useConfirmPersistencePrompt } from '../../../hooks/use_confirm_persistence_prompt';
 import { GetStateReturn } from '../services/discover_state';
@@ -29,6 +31,7 @@ export const useAdHocDataViews = ({
   filterManager,
   dataViews,
   toastNotifications,
+  trackUiMetric,
 }: {
   dataView: DataView;
   savedSearch: SavedSearch;
@@ -37,6 +40,7 @@ export const useAdHocDataViews = ({
   dataViews: DataViewsContract;
   filterManager: FilterManager;
   toastNotifications: ToastsStart;
+  trackUiMetric?: (metricType: string, eventName: string | string[], count?: number) => void;
 }) => {
   const [adHocDataViewList, setAdHocDataViewList] = useState<DataView[]>(
     !dataView.isPersisted() ? [dataView] : []
@@ -48,8 +52,9 @@ export const useAdHocDataViews = ({
         const existing = prev.find((prevDataView) => prevDataView.id === dataView.id);
         return existing ? prev : [...prev, dataView];
       });
+      trackUiMetric?.(METRIC_TYPE.COUNT, ADHOC_DATA_VIEW_RENDER_EVENT);
     }
-  }, [dataView]);
+  }, [dataView, trackUiMetric]);
 
   /**
    * Takes care of checking data view id references in filters

src/plugins/discover/public/application/main/hooks/use_discover_state.ts

@@ -44,7 +44,8 @@ export function useDiscoverState({
   setExpandedDoc: (doc?: DataTableRecord) => void;
   dataViewList: DataViewListItem[];
 }) {
-  const { uiSettings, data, filterManager, dataViews, toastNotifications } = services;
+  const { uiSettings, data, filterManager, dataViews, toastNotifications, trackUiMetric } =
+    services;
   const useNewFieldsApi = useMemo(() => !uiSettings.get(SEARCH_FIELDS_FROM_SOURCE), [uiSettings]);
   const { timefilter } = data.query.timefilter;
 
@@ -133,6 +134,7 @@ export function useDiscoverState({
       setUrlTracking,
       filterManager,
       toastNotifications,
+      trackUiMetric,
     });
 
   const [savedDataViewList, setSavedDataViewList] = useState(initialDataViewList);

src/plugins/discover/public/constants.ts

@@ -6,4 +6,6 @@
  * Side Public License, v 1.
  */
 
+export const ADHOC_DATA_VIEW_RENDER_EVENT = 'ad_hoc_data_view';
+
 export const SEARCH_SESSION_ID_QUERY_PARAM = 'searchSessionId';

src/plugins/discover/public/embeddable/saved_search_embeddable.tsx

@@ -34,6 +34,7 @@ import { DataView, DataViewField } from '@kbn/data-views-plugin/public';
 import { UiActionsStart } from '@kbn/ui-actions-plugin/public';
 import { KibanaContextProvider, KibanaThemeProvider } from '@kbn/kibana-react-plugin/public';
 import { SavedSearch } from '@kbn/saved-search-plugin/public';
+import { METRIC_TYPE } from '@kbn/analytics';
 import { getSortForEmbeddable, SortPair } from '../utils/sorting';
 import { RecordRawType } from '../application/main/hooks/use_saved_search';
 import { buildDataTableRecord } from '../utils/build_data_record';
@@ -60,6 +61,7 @@ import { updateSearchSource } from './utils/update_search_source';
 import { FieldStatisticsTable } from '../application/main/components/field_stats_table';
 import { getRawRecordType } from '../application/main/utils/get_raw_record_type';
 import { fetchSql } from '../application/main/utils/fetch_sql';
+import { ADHOC_DATA_VIEW_RENDER_EVENT } from '../constants';
 
 export type SearchProps = Partial<DiscoverGridProps> &
   Partial<DocTableProps> & {
@@ -302,6 +304,11 @@ export class SavedSearchEmbeddable
     }
     const sort = this.getSort(this.savedSearch.sort, dataView);
 
+    if (!dataView.isPersisted()) {
+      // one used adhoc data view
+      this.services.trackUiMetric?.(METRIC_TYPE.COUNT, ADHOC_DATA_VIEW_RENDER_EVENT);
+    }
+
     const props: SearchProps = {
       columns: this.savedSearch.columns,
       savedSearchId: this.savedSearch.id,