use Date.now() for instrument recording timestamps

CHANGELOG.md

@@ -22,6 +22,7 @@ For experimental package changes, see the [experimental CHANGELOG](experimental/
     * `telemetry.sdk.name`
     * `telemetry.sdk.language`
     * `telemetry.sdk.version`
+* fix(sdk-metrics): use Date.now() for instrument recording timestamps [#3514](https://github.com/open-telemetry/opentelemetry-js/pull/3514) @MisterSquishy
 * fix(selenium-tests): updated webpack version for selenium test issue [#3456](https://github.com/open-telemetry/opentelemetry-js/issues/3456) @SaumyaBhushan
 
 ### :books: (Refine Doc)

experimental/packages/opentelemetry-exporter-prometheus/test/util.ts

@@ -15,17 +15,13 @@
  */
 
 import * as sinon from 'sinon';
-import * as perf_hooks from 'perf_hooks';
 import { Resource } from '@opentelemetry/resources';
 import { SemanticResourceAttributes } from '@opentelemetry/semantic-conventions';
 
 export const mockedHrTimeMs = 1586347902211;
 
 export function mockHrTime() {
-  // We cannot stub core.now or core.timeOrigin since a property of
-  // ModuleNamespace can not be reconfigured.ß
-  sinon.stub(perf_hooks.performance, 'timeOrigin').value(0);
-  sinon.stub(perf_hooks.performance, 'now').returns(mockedHrTimeMs);
+  sinon.useFakeTimers(mockedHrTimeMs);
 }
 
 export const serviceName = Resource.default()

packages/opentelemetry-core/src/common/time.ts

@@ -33,7 +33,7 @@ const SECOND_TO_NANOSECONDS = Math.pow(10, NANOSECOND_DIGITS);
  * This is represented in HrTime format as [1609504210, 150000000].
  * @param epochMillis
  */
-function numberToHrtime(epochMillis: number): api.HrTime {
+export function numberToHrtime(epochMillis: number): api.HrTime {
   const epochSeconds = epochMillis / 1000;
   // Decimals only.
   const seconds = Math.trunc(epochSeconds);

packages/sdk-metrics/src/Instruments.ts

@@ -29,7 +29,7 @@ import {
   ObservableGauge,
   ObservableUpDownCounter,
 } from '@opentelemetry/api';
-import { hrTime } from '@opentelemetry/core';
+import { numberToHrtime } from '@opentelemetry/core';
 import { InstrumentDescriptor } from './InstrumentDescriptor';
 import { ObservableRegistry } from './state/ObservableRegistry';
 import {
@@ -57,7 +57,12 @@ export class SyncInstrument {
       );
       value = Math.trunc(value);
     }
-    this._writableMetricStorage.record(value, attributes, context, hrTime());
+    this._writableMetricStorage.record(
+      value,
+      attributes,
+      context,
+      numberToHrtime(Date.now())
+    );
   }
 }
 

packages/sdk-metrics/src/aggregator/LastValue.ts

@@ -22,7 +22,7 @@ import {
   LastValue,
 } from './types';
 import { HrTime } from '@opentelemetry/api';
-import { hrTime, hrTimeToMicroseconds } from '@opentelemetry/core';
+import { numberToHrtime, hrTimeToMicroseconds } from '@opentelemetry/core';
 import { DataPointType, GaugeMetricData } from '../export/MetricData';
 import { InstrumentDescriptor } from '../InstrumentDescriptor';
 import { Maybe } from '../utils';
@@ -37,7 +37,7 @@ export class LastValueAccumulation implements Accumulation {
 
   record(value: number): void {
     this._current = value;
-    this.sampleTime = hrTime();
+    this.sampleTime = numberToHrtime(Date.now());
   }
 
   setStartTime(startTime: HrTime): void {

packages/sdk-metrics/src/state/MetricCollector.ts

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-import { hrTime } from '@opentelemetry/core';
+import { numberToHrtime } from '@opentelemetry/core';
 import { AggregationTemporalitySelector } from '../export/AggregationSelector';
 import { CollectionResult } from '../export/MetricData';
 import { MetricProducer, MetricCollectOptions } from '../export/MetricProducer';
@@ -36,7 +36,7 @@ export class MetricCollector implements MetricProducer {
   ) {}
 
   async collect(options?: MetricCollectOptions): Promise<CollectionResult> {
-    const collectionTime = hrTime();
+    const collectionTime = numberToHrtime(Date.now());
     const meterCollectionPromises = Array.from(
       this._sharedState.meterSharedStates.values()
     ).map(meterSharedState =>