MM-58281 Change performance timestamps to be floats (#27046)

* MM-58281 Change performance timestamps to be floats

* Commit missed line

webapp/channels/src/utils/performance_telemetry/reporter.test.ts

@@ -52,23 +52,23 @@ describe('PerformanceReporter', () => {
         expect(sendBeacon.mock.calls[0][0]).toEqual(siteUrl + '/api/v4/client_perf');
         const report = JSON.parse(sendBeacon.mock.calls[0][1]);
         expect(report).toMatchObject({
-            start: Math.round(performance.timeOrigin + testMarkA.startTime),
-            end: Math.round(performance.timeOrigin + testMarkB.startTime),
+            start: performance.timeOrigin + testMarkA.startTime,
+            end: performance.timeOrigin + testMarkB.startTime,
             histograms: [
                 {
                     metric: 'testMeasureA',
                     value: testMarkB.startTime - testMarkA.startTime,
-                    timestamp: Math.round(performance.timeOrigin + testMarkA.startTime),
+                    timestamp: performance.timeOrigin + testMarkA.startTime,
                 },
                 {
                     metric: 'testMeasureB',
                     value: testMarkC.startTime - testMarkA.startTime,
-                    timestamp: Math.round(performance.timeOrigin + testMarkA.startTime),
+                    timestamp: performance.timeOrigin + testMarkA.startTime,
                 },
                 {
                     metric: 'testMeasureC',
                     value: testMarkC.startTime - testMarkB.startTime,
-                    timestamp: Math.round(performance.timeOrigin + testMarkB.startTime),
+                    timestamp: performance.timeOrigin + testMarkB.startTime,
                 },
             ],
         });
@@ -94,7 +94,7 @@ describe('PerformanceReporter', () => {
 
         expect(reporter.handleObservations).toHaveBeenCalled();
 
-        const timestamp = Math.round(performance.timeOrigin + performance.now());
+        const timestamp = performance.timeOrigin + performance.now();
 
         await waitForReport();
 

webapp/channels/src/utils/performance_telemetry/reporter.ts

@@ -141,7 +141,7 @@ export default class PerformanceReporter {
         this.histogramMeasures.push({
             metric: entry.name,
             value: entry.duration,
-            timestamp: Math.round(performance.timeOrigin + entry.startTime),
+            timestamp: performance.timeOrigin + entry.startTime,
         });
     }
 
@@ -166,7 +166,7 @@ export default class PerformanceReporter {
         this.histogramMeasures.push({
             metric: metric.name,
             value: metric.value,
-            timestamp: Math.round(performance.timeOrigin + performance.now()),
+            timestamp: performance.timeOrigin + performance.now(),
         });
     }
 
@@ -267,7 +267,7 @@ export default class PerformanceReporter {
             counterMeasures.push({
                 metric: name,
                 value,
-                timestamp: Math.round(now),
+                timestamp: now,
             });
         }