[Azure Monitor OpenTelemetry] Update Quickpulse transmission time (Az…

…ure#28411)

### Packages impacted by this PR
@azure/monitor-opentelemetry

sdk/monitor/monitor-opentelemetry/src/metrics/quickpulse/export/exporter.ts

@@ -16,7 +16,7 @@ import {
   PostOptionalParams,
   PostResponse,
 } from "../../../generated";
-import { resourceMetricsToQuickpulseDataPoint } from "../utils";
+import { getTransmissionTime, resourceMetricsToQuickpulseDataPoint } from "../utils";
 
 /**
  * Quickpulse Metric Exporter.
@@ -62,7 +62,7 @@ export class QuickpulseMetricExporter implements PushMetricExporter {
         this.baseMonitoringDataPoint,
         this.getDocumentsFn(),
       ),
-      xMsQpsTransmissionTime: Date.now(),
+      xMsQpsTransmissionTime: getTransmissionTime(),
     };
     // Supress tracing until OpenTelemetry Metrics SDK support it
     await context.with(suppressTracing(context.active()), async () => {

sdk/monitor/monitor-opentelemetry/src/metrics/quickpulse/liveMetrics.ts

@@ -37,6 +37,7 @@ import {
   getLogDocument,
   getSdkVersion,
   getSpanDocument,
+  getTransmissionTime,
 } from "./utils";
 import { QuickpulseMetricExporter } from "./export/exporter";
 import { QuickpulseSender } from "./export/sender";
@@ -150,7 +151,7 @@ export class LiveMetrics {
       // If not collecting, Ping
       try {
         let params: PingOptionalParams = {
-          xMsQpsTransmissionTime: Date.now(),
+          xMsQpsTransmissionTime: getTransmissionTime(),
           monitoringDataPoint: this.baseMonitoringDataPoint,
         };
         await context.with(suppressTracing(context.active()), async () => {

sdk/monitor/monitor-opentelemetry/src/metrics/quickpulse/utils.ts

@@ -273,3 +273,16 @@ function getUrl(attributes: Attributes): string {
   }
   return "";
 }
+
+/**
+ * @description UTC time the request was made. Expressed as the number of 100-nanosecond intervals that have elapsed since 12:00:00 midnight on January 1, 0001. This is used for clock skew calculations, so the value can never be stale (cached).
+ *
+ * @example
+ * 8/5/2020 10:15:00 PM UTC => 637322625000000000
+ * 8/5/2020 10:15:01 PM UTC => 637322625010000000
+ *
+ * @returns {number}
+ */
+export function getTransmissionTime(): number {
+  return (Date.now() + 62135596800000) * 10000;
+}