[Embeddables] Decouple fetching from search sessions

src/platform/packages/shared/kbn-unified-histogram/components/chart/chart.tsx

@@ -72,6 +72,7 @@ export interface UnifiedHistogramChartProps {
   isPlainRecord?: boolean;
   lensVisService: LensVisService;
   relativeTimeRange?: TimeRange;
+  lastReloadRequestTime?: number;
   request?: UnifiedHistogramRequestContext;
   hits?: UnifiedHistogramHitsContext;
   chart?: UnifiedHistogramChartContext;
@@ -104,6 +105,7 @@ export function UnifiedHistogramChart({
   dataView,
   requestParams,
   relativeTimeRange: originalRelativeTimeRange,
+  lastReloadRequestTime,
   request,
   hits,
   chart,
@@ -223,6 +225,7 @@ export function UnifiedHistogramChart({
     visContext,
     esqlVariables,
     onLoad,
+    lastReloadRequestTime,
   });
 
   const { chartToolbarCss, histogramCss } = useChartStyles(chartVisible);

src/platform/packages/shared/kbn-unified-histogram/components/chart/hooks/use_lens_props.ts

@@ -31,6 +31,7 @@ export type LensProps = Pick<
   | 'searchSessionId'
   | 'executionContext'
   | 'onLoad'
+  | 'lastReloadRequestTime'
 >;
 
 export const useLensProps = ({
@@ -40,13 +41,15 @@ export const useLensProps = ({
   visContext,
   esqlVariables,
   onLoad,
+  lastReloadRequestTime,
 }: {
   request?: UnifiedHistogramRequestContext;
   getTimeRange: () => TimeRange;
   fetch$: Observable<UnifiedHistogramInputMessage>;
   visContext?: UnifiedHistogramVisContext;
   esqlVariables?: ESQLControlVariable[];
   onLoad: (isLoading: boolean, adapters: Partial<DefaultInspectorAdapters> | undefined) => void;
+  lastReloadRequestTime?: number;
 }) => {
   const buildLensProps = useCallback(() => {
     if (!visContext) {
@@ -63,9 +66,17 @@ export const useLensProps = ({
         attributes,
         esqlVariables,
         onLoad,
+        lastReloadRequestTime,
       }),
     };
-  }, [visContext, request?.searchSessionId, getTimeRange, esqlVariables, onLoad]);
+  }, [
+    visContext,
+    request?.searchSessionId,
+    getTimeRange,
+    esqlVariables,
+    onLoad,
+    lastReloadRequestTime,
+  ]);
 
   // Initialize with undefined to avoid rendering Lens until a fetch has been triggered
   const [lensPropsContext, setLensPropsContext] = useState<ReturnType<typeof buildLensProps>>();
@@ -85,12 +96,14 @@ export const getLensProps = ({
   attributes,
   esqlVariables,
   onLoad,
+  lastReloadRequestTime,
 }: {
   searchSessionId?: string;
   getTimeRange: () => TimeRange;
   attributes: TypedLensByValueInput['attributes'];
   esqlVariables?: ESQLControlVariable[];
   onLoad: (isLoading: boolean, adapters: Partial<DefaultInspectorAdapters> | undefined) => void;
+  lastReloadRequestTime?: number;
 }): LensProps => ({
   id: 'unifiedHistogramLensComponent',
   viewMode: 'view',
@@ -103,4 +116,5 @@ export const getLensProps = ({
     description: 'fetch chart data and total hits',
   },
   onLoad,
+  lastReloadRequestTime,
 });

src/platform/packages/shared/kbn-unified-histogram/hooks/use_unified_histogram.ts

@@ -95,6 +95,10 @@ export type UseUnifiedHistogramProps = Omit<UnifiedHistogramStateOptions, 'servi
    * The relative time range, used when timeRange is an absolute range (e.g. for edit visualization button)
    */
   relativeTimeRange?: TimeRange;
+  /**
+   * The timestamp of the last data request
+   */
+  lastReloadRequestTime?: number;
   /**
    * The current columns
    */