[Synthetics] Fix issue where heatmap UI crashes on undefined histogram data

x-pack/plugins/observability_solution/synthetics/public/apps/synthetics/components/monitor_details/monitor_status/monitor_status_data.test.ts

@@ -0,0 +1,87 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0; you may not use this file except in compliance with the Elastic License
+ * 2.0.
+ */
+
+import { createStatusTimeBins, getStatusEffectiveValue } from './monitor_status_data';
+
+describe('createStatusTimeBins', () => {
+  beforeEach(() => {
+    jest.clearAllMocks();
+  });
+
+  it('should return default values when `heatmapData` is `undefined`', () => {
+    const timeBuckets = [
+      { start: 1000, end: 2000 },
+      { start: 2000, end: 3000 },
+    ];
+
+    const result = createStatusTimeBins(timeBuckets, undefined);
+
+    expect(result).toEqual([
+      { start: 1000, end: 2000, ups: 0, downs: 0, value: 0 },
+      { start: 2000, end: 3000, ups: 0, downs: 0, value: 0 },
+    ]);
+  });
+
+  it('should calculate `ups` and `downs` correctly from `heatmapData`', () => {
+    const timeBuckets = [
+      { start: 1000, end: 2000 },
+      { start: 2000, end: 3000 },
+    ];
+
+    const heatmapData = [
+      { key: 1500, key_as_string: '1500', up: { value: 1 }, down: { value: 2 }, doc_count: 3 },
+      { key: 2500, key_as_string: '2500', up: { value: 3 }, down: { value: 1 }, doc_count: 4 },
+    ];
+
+    const result = createStatusTimeBins(timeBuckets, heatmapData);
+
+    expect(result).toEqual([
+      { start: 1000, end: 2000, ups: 1, downs: 2, value: getStatusEffectiveValue(1, 2) },
+      { start: 2000, end: 3000, ups: 3, downs: 1, value: getStatusEffectiveValue(3, 1) },
+    ]);
+  });
+
+  it('should return value 0 when ups + downs is 0', () => {
+    const timeBuckets = [
+      { start: 1000, end: 2000 },
+      { start: 2000, end: 3000 },
+    ];
+
+    const heatmapData = [
+      { key: 1500, key_as_string: '1500', up: { value: 0 }, down: { value: 0 }, doc_count: 0 },
+      { key: 2500, key_as_string: '2500', up: { value: 0 }, down: { value: 0 }, doc_count: 0 },
+    ];
+
+    const result = createStatusTimeBins(timeBuckets, heatmapData);
+
+    expect(result).toEqual([
+      { start: 1000, end: 2000, ups: 0, downs: 0, value: 0 },
+      { start: 2000, end: 3000, ups: 0, downs: 0, value: 0 },
+    ]);
+  });
+
+  it('should filter heatmapData correctly based on start and end values', () => {
+    const timeBuckets = [
+      { start: 1000, end: 2000 },
+      { start: 2000, end: 3000 },
+    ];
+
+    const heatmapData = [
+      { key: 500, key_as_string: '500', doc_count: 2, up: { value: 1 }, down: { value: 1 } },
+      { key: 1500, key_as_string: '1500', doc_count: 5, up: { value: 2 }, down: { value: 3 } },
+      { key: 2500, key_as_string: '2500', doc_count: 9, up: { value: 4 }, down: { value: 5 } },
+      { key: 3500, key_as_string: '3500', doc_count: 1, up: { value: 6 }, down: { value: 7 } },
+    ];
+
+    const result = createStatusTimeBins(timeBuckets, heatmapData);
+
+    expect(result).toEqual([
+      { start: 1000, end: 2000, ups: 2, downs: 3, value: getStatusEffectiveValue(2, 3) },
+      { start: 2000, end: 3000, ups: 4, downs: 5, value: getStatusEffectiveValue(4, 5) },
+    ]);
+  });
+});

x-pack/plugins/observability_solution/synthetics/public/apps/synthetics/components/monitor_details/monitor_status/monitor_status_data.ts

@@ -114,9 +114,18 @@ export function createTimeBuckets(intervalMinutes: number, from: number, to: num
 
 export function createStatusTimeBins(
   timeBuckets: MonitorStatusTimeBucket[],
-  heatmapData: MonitorStatusHeatmapBucket[]
+  heatmapData?: MonitorStatusHeatmapBucket[]
 ): MonitorStatusTimeBin[] {
   return timeBuckets.map(({ start, end }) => {
+    if (!Array.isArray(heatmapData)) {
+      return {
+        start,
+        end,
+        ups: 0,
+        downs: 0,
+        value: 0,
+      };
+    }
     const { ups, downs } = heatmapData
       .filter(({ key }) => key >= start && key <= end)
       .reduce(
@@ -163,7 +172,7 @@ export function getBrushData(e: BrushEvent) {
   return { from, to, fromUtc, toUtc };
 }
 
-function getStatusEffectiveValue(ups: number, downs: number): number {
+export function getStatusEffectiveValue(ups: number, downs: number): number {
   if (ups === downs) {
     return -0.1;
   }

x-pack/plugins/observability_solution/synthetics/public/apps/synthetics/components/monitor_details/monitor_status/use_monitor_status_data.ts

@@ -59,7 +59,7 @@ export const useMonitorStatusData = ({ from, to, initialSizeRef }: Props) => {
   }, [binsAvailableByWidth, initialSizeRef]);
 
   useEffect(() => {
-    if (monitor?.id && location?.label && debouncedBinsCount !== null && minsPerBin !== null) {
+    if (monitor?.id && location?.label && debouncedBinsCount !== null && !!minsPerBin) {
       dispatch(
         quietGetMonitorStatusHeatmapAction.get({
           monitorId: monitor.id,

x-pack/plugins/observability_solution/synthetics/public/apps/synthetics/state/status_heatmap/index.ts

@@ -18,7 +18,7 @@ import {
 } from './actions';
 
 export interface MonitorStatusHeatmap {
-  heatmap: MonitorStatusHeatmapBucket[];
+  heatmap?: MonitorStatusHeatmapBucket[];
   loading: boolean;
   error: IHttpSerializedFetchError | null;
 }