From 19f265aa87bf5a39375d166fd65972a3e2b5f687 Mon Sep 17 00:00:00 2001
From: Abhijeet Prasad <aprasad@sentry.io>
Date: Mon, 18 Mar 2024 17:50:35 -0400
Subject: [PATCH 1/9] fix(metrics): use web-vitals ttfb calculation

---
 .../tracing-internal/src/browser/index.ts     |  1 +
 .../src/browser/instrument.ts                 | 20 +++-
 .../src/browser/metrics/index.ts              | 58 +++++-------
 .../src/browser/web-vitals/README.md          | 11 +++
 .../src/browser/web-vitals/onTTFB.ts          | 91 +++++++++++++++++++
 .../src/browser/web-vitals/types/base.ts      |  2 +-
 .../src/browser/web-vitals/types/ttfb.ts      | 80 ++++++++++++++++
 packages/tracing-internal/src/index.ts        |  1 +
 8 files changed, 229 insertions(+), 35 deletions(-)
 create mode 100644 packages/tracing-internal/src/browser/web-vitals/onTTFB.ts
 create mode 100644 packages/tracing-internal/src/browser/web-vitals/types/ttfb.ts

diff --git a/packages/tracing-internal/src/browser/index.ts b/packages/tracing-internal/src/browser/index.ts
index d1bbbffe02b3..6d4168329dc4 100644
--- a/packages/tracing-internal/src/browser/index.ts
+++ b/packages/tracing-internal/src/browser/index.ts
@@ -15,5 +15,6 @@ export {
   addPerformanceInstrumentationHandler,
   addClsInstrumentationHandler,
   addFidInstrumentationHandler,
+  addTtfbInstrumentationHandler,
   addLcpInstrumentationHandler,
 } from './instrument';
diff --git a/packages/tracing-internal/src/browser/instrument.ts b/packages/tracing-internal/src/browser/instrument.ts
index 2a4e7acaf3b1..35e251983508 100644
--- a/packages/tracing-internal/src/browser/instrument.ts
+++ b/packages/tracing-internal/src/browser/instrument.ts
@@ -5,10 +5,11 @@ import { onCLS } from './web-vitals/getCLS';
 import { onFID } from './web-vitals/getFID';
 import { onLCP } from './web-vitals/getLCP';
 import { observe } from './web-vitals/lib/observe';
+import { onTTFB } from './web-vitals/onTTFB';
 
 type InstrumentHandlerTypePerformanceObserver = 'longtask' | 'event' | 'navigation' | 'paint' | 'resource';
 
-type InstrumentHandlerTypeMetric = 'cls' | 'lcp' | 'fid';
+type InstrumentHandlerTypeMetric = 'cls' | 'lcp' | 'fid' | 'ttfb';
 
 // We provide this here manually instead of relying on a global, as this is not available in non-browser environements
 // And we do not want to expose such types
@@ -86,6 +87,7 @@ const instrumented: { [key in InstrumentHandlerType]?: boolean } = {};
 let _previousCls: Metric | undefined;
 let _previousFid: Metric | undefined;
 let _previousLcp: Metric | undefined;
+let _previousTtfb: Metric | undefined;
 
 /**
  * Add a callback that will be triggered when a CLS metric is available.
@@ -123,6 +125,13 @@ export function addFidInstrumentationHandler(callback: (data: { metric: Metric }
   return addMetricObserver('fid', callback, instrumentFid, _previousFid);
 }
 
+/**
+ * Add a callback that will be triggered when a FID metric is available.
+ */
+export function addTtfbInstrumentationHandler(callback: (data: { metric: Metric }) => void): CleanupHandlerCallback {
+  return addMetricObserver('ttfb', callback, instrumentTtfb, _previousTtfb);
+}
+
 export function addPerformanceInstrumentationHandler(
   type: 'event',
   callback: (data: { entries: (PerformanceEntry & { target?: unknown | null })[] }) => void,
@@ -199,6 +208,15 @@ function instrumentLcp(): StopListening {
   });
 }
 
+function instrumentTtfb(): StopListening {
+  return onTTFB(metric => {
+    triggerHandlers('ttfb', {
+      metric,
+    });
+    _previousTtfb = metric;
+  });
+}
+
 function addMetricObserver(
   type: InstrumentHandlerTypeMetric,
   callback: InstrumentHandlerCallback,
diff --git a/packages/tracing-internal/src/browser/metrics/index.ts b/packages/tracing-internal/src/browser/metrics/index.ts
index 4eabd49f218c..50007a4600df 100644
--- a/packages/tracing-internal/src/browser/metrics/index.ts
+++ b/packages/tracing-internal/src/browser/metrics/index.ts
@@ -11,10 +11,13 @@ import {
   addFidInstrumentationHandler,
   addLcpInstrumentationHandler,
   addPerformanceInstrumentationHandler,
+  addTtfbInstrumentationHandler,
 } from '../instrument';
 import { WINDOW } from '../types';
+import { getNavigationEntry } from '../web-vitals/lib/getNavigationEntry';
 import { getVisibilityWatcher } from '../web-vitals/lib/getVisibilityWatcher';
 import type { NavigatorDeviceMemory, NavigatorNetworkInformation } from '../web-vitals/types';
+import type { TTFBMetric } from '../web-vitals/types/ttfb';
 import { isMeasurementValue, startAndEndSpan } from './utils';
 
 const MAX_INT_AS_BYTES = 2147483647;
@@ -54,11 +57,13 @@ export function startTrackingWebVitals(): () => void {
     const fidCallback = _trackFID();
     const clsCallback = _trackCLS();
     const lcpCallback = _trackLCP();
+    const ttfbCallback = _trackTtfb();
 
     return (): void => {
       fidCallback();
       clsCallback();
       lcpCallback();
+      ttfbCallback();
     };
   }
 
@@ -173,6 +178,18 @@ function _trackFID(): () => void {
   });
 }
 
+function _trackTtfb(): () => void {
+  return addTtfbInstrumentationHandler(({ metric }) => {
+    const entry = metric.entries[metric.entries.length - 1];
+    if (!entry) {
+      return;
+    }
+
+    DEBUG_BUILD && logger.log('[Measurements] Adding TTFB');
+    _measurements['ttfb'] = { value: metric.value, unit: 'millisecond' };
+  });
+}
+
 /** Add performance related spans to a span */
 export function addPerformanceEntries(span: Span): void {
   const performance = getBrowserPerformanceAPI();
@@ -186,9 +203,6 @@ export function addPerformanceEntries(span: Span): void {
 
   const performanceEntries = performance.getEntries();
 
-  let responseStartTimestamp: number | undefined;
-  let requestStartTimestamp: number | undefined;
-
   const { op, start_timestamp: transactionStartTime } = spanToJSON(span);
 
   // eslint-disable-next-line @typescript-eslint/no-explicit-any
@@ -203,8 +217,6 @@ export function addPerformanceEntries(span: Span): void {
     switch (entry.entryType) {
       case 'navigation': {
         _addNavigationSpans(span, entry, timeOrigin);
-        responseStartTimestamp = timeOrigin + msToSec(entry.responseStart);
-        requestStartTimestamp = timeOrigin + msToSec(entry.requestStart);
         break;
       }
       case 'mark':
@@ -242,7 +254,7 @@ export function addPerformanceEntries(span: Span): void {
 
   // Measurements are only available for pageload transactions
   if (op === 'pageload') {
-    _addTtfbToMeasurements(_measurements, responseStartTimestamp, requestStartTimestamp, transactionStartTime);
+    _addTtfbRequestTimeToMeasurements(_measurements);
 
     ['fcp', 'fp', 'lcp'].forEach(name => {
       if (!_measurements[name] || !transactionStartTime || timeOrigin >= transactionStartTime) {
@@ -528,35 +540,15 @@ function setResourceEntrySizeData(
  *
  * Exported for tests
  */
-export function _addTtfbToMeasurements(
-  _measurements: Measurements,
-  responseStartTimestamp: number | undefined,
-  requestStartTimestamp: number | undefined,
-  transactionStartTime: number | undefined,
-): void {
-  // Generate TTFB (Time to First Byte), which measured as the time between the beginning of the span and the
-  // start of the response in milliseconds
-  if (typeof responseStartTimestamp === 'number' && transactionStartTime) {
+export function _addTtfbRequestTimeToMeasurements(_measurements: Measurements): void {
+  const navEntry = getNavigationEntry() as TTFBMetric['entries'][number];
+  const { responseStart, requestStart } = navEntry;
+
+  if (requestStart <= responseStart) {
     DEBUG_BUILD && logger.log('[Measurements] Adding TTFB');
-    _measurements['ttfb'] = {
-      // As per https://developer.mozilla.org/en-US/docs/Web/API/PerformanceResourceTiming/responseStart,
-      // responseStart can be 0 if the request is coming straight from the cache.
-      // This might lead us to calculate a negative ttfb if we don't use Math.max here.
-      //
-      // This logic is the same as what is in the web-vitals library to calculate ttfb
-      // https://github.com/GoogleChrome/web-vitals/blob/2301de5015e82b09925238a228a0893635854587/src/onTTFB.ts#L92
-      // TODO(abhi): We should use the web-vitals library instead of this custom calculation.
-      value: Math.max(responseStartTimestamp - transactionStartTime, 0) * 1000,
+    _measurements['ttfb.requestTime'] = {
+      value: (responseStart - requestStart) * 1000,
       unit: 'millisecond',
     };
-
-    if (typeof requestStartTimestamp === 'number' && requestStartTimestamp <= responseStartTimestamp) {
-      // Capture the time spent making the request and receiving the first byte of the response.
-      // This is the time between the start of the request and the start of the response in milliseconds.
-      _measurements['ttfb.requestTime'] = {
-        value: (responseStartTimestamp - requestStartTimestamp) * 1000,
-        unit: 'millisecond',
-      };
-    }
   }
 }
diff --git a/packages/tracing-internal/src/browser/web-vitals/README.md b/packages/tracing-internal/src/browser/web-vitals/README.md
index 73a0a72c2e4b..2350f171ce74 100644
--- a/packages/tracing-internal/src/browser/web-vitals/README.md
+++ b/packages/tracing-internal/src/browser/web-vitals/README.md
@@ -12,6 +12,8 @@ Current vendored web vitals are:
 - LCP (Largest Contentful Paint)
 - FID (First Input Delay)
 - CLS (Cumulative Layout Shift)
+- INP (Interaction to Next Paint)
+- TTFB (Time to First Byte)
 
 ## Notable Changes from web-vitals library
 
@@ -44,3 +46,12 @@ https://github.com/getsentry/sentry-javascript/pull/2964
 https://github.com/getsentry/sentry-javascript/pull/2909
 
 - Added support for FID (First Input Delay) and LCP (Largest Contentful Paint)
+
+https://github.com/getsentry/sentry-javascript/pull/9690
+
+- Added support for INP (Interaction to Next Paint)
+
+TODO
+
+- Add support for TTFB (Time to First Byte)
+
diff --git a/packages/tracing-internal/src/browser/web-vitals/onTTFB.ts b/packages/tracing-internal/src/browser/web-vitals/onTTFB.ts
new file mode 100644
index 000000000000..946141107fa8
--- /dev/null
+++ b/packages/tracing-internal/src/browser/web-vitals/onTTFB.ts
@@ -0,0 +1,91 @@
+/*
+ * Copyright 2020 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { WINDOW } from '../types';
+import { bindReporter } from './lib/bindReporter';
+import { getActivationStart } from './lib/getActivationStart';
+import { getNavigationEntry } from './lib/getNavigationEntry';
+import { initMetric } from './lib/initMetric';
+import type { ReportCallback, ReportOpts } from './types';
+import type { TTFBMetric } from './types/ttfb';
+
+/**
+ * Runs in the next task after the page is done loading and/or prerendering.
+ * @param callback
+ */
+const whenReady = (callback: () => void): void => {
+  if (!WINDOW.document) {
+    return;
+  }
+
+  if (WINDOW.document.prerendering) {
+    addEventListener('prerenderingchange', () => whenReady(callback), true);
+  } else if (WINDOW.document.readyState !== 'complete') {
+    addEventListener('load', () => whenReady(callback), true);
+  } else {
+    // Queue a task so the callback runs after `loadEventEnd`.
+    setTimeout(callback, 0);
+  }
+};
+
+/**
+ * Calculates the [TTFB](https://web.dev/time-to-first-byte/) value for the
+ * current page and calls the `callback` function once the page has loaded,
+ * along with the relevant `navigation` performance entry used to determine the
+ * value. The reported value is a `DOMHighResTimeStamp`.
+ *
+ * Note, this function waits until after the page is loaded to call `callback`
+ * in order to ensure all properties of the `navigation` entry are populated.
+ * This is useful if you want to report on other metrics exposed by the
+ * [Navigation Timing API](https://w3c.github.io/navigation-timing/). For
+ * example, the TTFB metric starts from the page's [time
+ * origin](https://www.w3.org/TR/hr-time-2/#sec-time-origin), which means it
+ * includes time spent on DNS lookup, connection negotiation, network latency,
+ * and server processing time.
+ */
+export const onTTFB = (onReport: ReportCallback, opts?: ReportOpts): void => {
+  // Set defaults
+  // eslint-disable-next-line no-param-reassign
+  opts = opts || {};
+
+  // https://web.dev/ttfb/#what-is-a-good-ttfb-score
+  // const thresholds = [800, 1800];
+
+  const metric = initMetric('TTFB');
+  const report = bindReporter(onReport, metric, opts.reportAllChanges);
+
+  whenReady(() => {
+    const navEntry = getNavigationEntry() as TTFBMetric['entries'][number];
+
+    if (navEntry) {
+      // The activationStart reference is used because TTFB should be
+      // relative to page activation rather than navigation start if the
+      // page was prerendered. But in cases where `activationStart` occurs
+      // after the first byte is received, this time should be clamped at 0.
+      metric.value = Math.max(navEntry.responseStart - getActivationStart(), 0);
+
+      // In some cases the value reported is negative or is larger
+      // than the current page time. Ignore these cases:
+      // https://github.com/GoogleChrome/web-vitals/issues/137
+      // https://github.com/GoogleChrome/web-vitals/issues/162
+      if (metric.value < 0 || metric.value > performance.now()) return;
+
+      metric.entries = [navEntry];
+
+      report(true);
+    }
+  });
+};
diff --git a/packages/tracing-internal/src/browser/web-vitals/types/base.ts b/packages/tracing-internal/src/browser/web-vitals/types/base.ts
index ea2764c8ea64..6d748d7843b4 100644
--- a/packages/tracing-internal/src/browser/web-vitals/types/base.ts
+++ b/packages/tracing-internal/src/browser/web-vitals/types/base.ts
@@ -105,4 +105,4 @@ export interface ReportOpts {
  */
 export type LoadState = 'loading' | 'dom-interactive' | 'dom-content-loaded' | 'complete';
 
-export type StopListening = () => void;
+export type StopListening = undefined | void | (() => void);
diff --git a/packages/tracing-internal/src/browser/web-vitals/types/ttfb.ts b/packages/tracing-internal/src/browser/web-vitals/types/ttfb.ts
new file mode 100644
index 000000000000..86f1329ebee8
--- /dev/null
+++ b/packages/tracing-internal/src/browser/web-vitals/types/ttfb.ts
@@ -0,0 +1,80 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import type { Metric, ReportCallback } from './base';
+import type { NavigationTimingPolyfillEntry } from './polyfills';
+
+/**
+ * A TTFB-specific version of the Metric object.
+ */
+export interface TTFBMetric extends Metric {
+  name: 'TTFB';
+  entries: PerformanceNavigationTiming[] | NavigationTimingPolyfillEntry[];
+}
+
+/**
+ * An object containing potentially-helpful debugging information that
+ * can be sent along with the TTFB value for the current page visit in order
+ * to help identify issues happening to real-users in the field.
+ */
+export interface TTFBAttribution {
+  /**
+   * The total time from when the user initiates loading the page to when the
+   * DNS lookup begins. This includes redirects, service worker startup, and
+   * HTTP cache lookup times.
+   */
+  waitingTime: number;
+  /**
+   * The total time to resolve the DNS for the current request.
+   */
+  dnsTime: number;
+  /**
+   * The total time to create the connection to the requested domain.
+   */
+  connectionTime: number;
+  /**
+   * The time time from when the request was sent until the first byte of the
+   * response was received. This includes network time as well as server
+   * processing time.
+   */
+  requestTime: number;
+  /**
+   * The `PerformanceNavigationTiming` entry used to determine TTFB (or the
+   * polyfill entry in browsers that don't support Navigation Timing).
+   */
+  navigationEntry?: PerformanceNavigationTiming | NavigationTimingPolyfillEntry;
+}
+
+/**
+ * A TTFB-specific version of the Metric object with attribution.
+ */
+export interface TTFBMetricWithAttribution extends TTFBMetric {
+  attribution: TTFBAttribution;
+}
+
+/**
+ * A TTFB-specific version of the ReportCallback function.
+ */
+export interface TTFBReportCallback extends ReportCallback {
+  (metric: TTFBMetric): void;
+}
+
+/**
+ * A TTFB-specific version of the ReportCallback function with attribution.
+ */
+export interface TTFBReportCallbackWithAttribution extends TTFBReportCallback {
+  (metric: TTFBMetricWithAttribution): void;
+}
diff --git a/packages/tracing-internal/src/index.ts b/packages/tracing-internal/src/index.ts
index 98efc8dc1032..2dd4cf2f1768 100644
--- a/packages/tracing-internal/src/index.ts
+++ b/packages/tracing-internal/src/index.ts
@@ -22,6 +22,7 @@ export {
   addPerformanceInstrumentationHandler,
   addClsInstrumentationHandler,
   addFidInstrumentationHandler,
+  addTtfbInstrumentationHandler,
   addLcpInstrumentationHandler,
 } from './browser';
 

From 74d26c801cb589ca3f58945f0369949441b741a8 Mon Sep 17 00:00:00 2001
From: Abhijeet Prasad <aprasad@sentry.io>
Date: Mon, 18 Mar 2024 18:12:19 -0400
Subject: [PATCH 2/9] test fixes

---
 .../tracing/metrics/web-vitals-ttfb/test.ts   |  2 ++
 .../test/browser/metrics/index.test.ts        | 23 ++++---------------
 2 files changed, 6 insertions(+), 19 deletions(-)

diff --git a/dev-packages/browser-integration-tests/suites/tracing/metrics/web-vitals-ttfb/test.ts b/dev-packages/browser-integration-tests/suites/tracing/metrics/web-vitals-ttfb/test.ts
index 0a4b1e6d3da6..dafb6acb8015 100644
--- a/dev-packages/browser-integration-tests/suites/tracing/metrics/web-vitals-ttfb/test.ts
+++ b/dev-packages/browser-integration-tests/suites/tracing/metrics/web-vitals-ttfb/test.ts
@@ -14,5 +14,7 @@ sentryTest('should capture TTFB vital.', async ({ getLocalTestPath, page }) => {
 
   expect(eventData.measurements).toBeDefined();
   expect(eventData.measurements?.ttfb?.value).toBeDefined();
+  expect(eventData.measurements?.ttfb?.value).toBeGreaterThan(0);
   expect(eventData.measurements?.['ttfb.requestTime']?.value).toBeDefined();
+  expect(eventData.measurements?.['ttfb.requestTime']?.value).toBeGreaterThan(0);
 });
diff --git a/packages/tracing-internal/test/browser/metrics/index.test.ts b/packages/tracing-internal/test/browser/metrics/index.test.ts
index 84b3950aeeec..4e4fb2f6e599 100644
--- a/packages/tracing-internal/test/browser/metrics/index.test.ts
+++ b/packages/tracing-internal/test/browser/metrics/index.test.ts
@@ -10,7 +10,7 @@ import {
 } from '@sentry/core';
 import type { Span } from '@sentry/types';
 import type { ResourceEntry } from '../../../src/browser/metrics';
-import { _addTtfbToMeasurements } from '../../../src/browser/metrics';
+import { _addTtfbRequestTimeToMeasurements} from '../../../src/browser/metrics';
 import { _addMeasureSpans, _addResourceSpans } from '../../../src/browser/metrics';
 import { WINDOW } from '../../../src/browser/types';
 import { TestClient, getDefaultClientOptions } from '../../utils/TestClient';
@@ -341,32 +341,17 @@ describe('_addResourceSpans', () => {
   });
 });
 
-describe('_addTtfbToMeasurements', () => {
-  it('adds ttfb to measurements', () => {
+describe('_addTtfbRequestTimeToMeasurements', () => {
+  it('adds ttfb.requestTime to measurements', () => {
     const measurements = {};
-    _addTtfbToMeasurements(measurements, 300, 200, 100);
+    _addTtfbRequestTimeToMeasurements(measurements);
     expect(measurements).toEqual({
-      ttfb: {
-        unit: 'millisecond',
-        value: 200000,
-      },
       'ttfb.requestTime': {
         unit: 'millisecond',
         value: 100000,
       },
     });
   });
-
-  it('does not add negative ttfb', () => {
-    const measurements = {};
-    _addTtfbToMeasurements(measurements, 100, 200, 300);
-    expect(measurements).toEqual({
-      ttfb: {
-        unit: 'millisecond',
-        value: 0,
-      },
-    });
-  });
 });
 
 const setGlobalLocation = (location: Location) => {

From 1c2525585116f45bce34792165639ad30e2cf446 Mon Sep 17 00:00:00 2001
From: Abhijeet Prasad <aprasad@sentry.io>
Date: Mon, 18 Mar 2024 18:25:25 -0400
Subject: [PATCH 3/9] yarn fix

---
 .../tracing-internal/src/browser/metrics/index.ts  |  6 +++---
 .../src/browser/web-vitals/README.md               |  1 -
 .../test/browser/metrics/index.test.ts             | 14 --------------
 3 files changed, 3 insertions(+), 18 deletions(-)

diff --git a/packages/tracing-internal/src/browser/metrics/index.ts b/packages/tracing-internal/src/browser/metrics/index.ts
index 50007a4600df..aae638a54c7e 100644
--- a/packages/tracing-internal/src/browser/metrics/index.ts
+++ b/packages/tracing-internal/src/browser/metrics/index.ts
@@ -536,11 +536,11 @@ function setResourceEntrySizeData(
 }
 
 /**
- * Add ttfb information to measurements
+ * Add ttfb request time information to measurements.
  *
- * Exported for tests
+ * ttfb information is added via vendored web vitals library.
  */
-export function _addTtfbRequestTimeToMeasurements(_measurements: Measurements): void {
+function _addTtfbRequestTimeToMeasurements(_measurements: Measurements): void {
   const navEntry = getNavigationEntry() as TTFBMetric['entries'][number];
   const { responseStart, requestStart } = navEntry;
 
diff --git a/packages/tracing-internal/src/browser/web-vitals/README.md b/packages/tracing-internal/src/browser/web-vitals/README.md
index 2350f171ce74..c87dd69d55b7 100644
--- a/packages/tracing-internal/src/browser/web-vitals/README.md
+++ b/packages/tracing-internal/src/browser/web-vitals/README.md
@@ -54,4 +54,3 @@ https://github.com/getsentry/sentry-javascript/pull/9690
 TODO
 
 - Add support for TTFB (Time to First Byte)
-
diff --git a/packages/tracing-internal/test/browser/metrics/index.test.ts b/packages/tracing-internal/test/browser/metrics/index.test.ts
index 4e4fb2f6e599..b0015ca0a514 100644
--- a/packages/tracing-internal/test/browser/metrics/index.test.ts
+++ b/packages/tracing-internal/test/browser/metrics/index.test.ts
@@ -10,7 +10,6 @@ import {
 } from '@sentry/core';
 import type { Span } from '@sentry/types';
 import type { ResourceEntry } from '../../../src/browser/metrics';
-import { _addTtfbRequestTimeToMeasurements} from '../../../src/browser/metrics';
 import { _addMeasureSpans, _addResourceSpans } from '../../../src/browser/metrics';
 import { WINDOW } from '../../../src/browser/types';
 import { TestClient, getDefaultClientOptions } from '../../utils/TestClient';
@@ -341,19 +340,6 @@ describe('_addResourceSpans', () => {
   });
 });
 
-describe('_addTtfbRequestTimeToMeasurements', () => {
-  it('adds ttfb.requestTime to measurements', () => {
-    const measurements = {};
-    _addTtfbRequestTimeToMeasurements(measurements);
-    expect(measurements).toEqual({
-      'ttfb.requestTime': {
-        unit: 'millisecond',
-        value: 100000,
-      },
-    });
-  });
-});
-
 const setGlobalLocation = (location: Location) => {
   // @ts-expect-error need to delete this in order to set to new value
   delete WINDOW.location;

From e3551163831866f50a80831949cdc981ddae7785 Mon Sep 17 00:00:00 2001
From: Abhijeet Prasad <aprasad@sentry.io>
Date: Mon, 18 Mar 2024 18:32:14 -0400
Subject: [PATCH 4/9] better playwright test

---
 .../suites/tracing/metrics/web-vitals-ttfb/test.ts       | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/dev-packages/browser-integration-tests/suites/tracing/metrics/web-vitals-ttfb/test.ts b/dev-packages/browser-integration-tests/suites/tracing/metrics/web-vitals-ttfb/test.ts
index dafb6acb8015..5bcab89447b5 100644
--- a/dev-packages/browser-integration-tests/suites/tracing/metrics/web-vitals-ttfb/test.ts
+++ b/dev-packages/browser-integration-tests/suites/tracing/metrics/web-vitals-ttfb/test.ts
@@ -9,12 +9,19 @@ sentryTest('should capture TTFB vital.', async ({ getLocalTestPath, page }) => {
     sentryTest.skip();
   }
 
+  page.route('**', async (route) => {
+    await new Promise((resolve) => setTimeout(resolve, 3000));
+    route.continue()
+  });
+
   const url = await getLocalTestPath({ testDir: __dirname });
   const eventData = await getFirstSentryEnvelopeRequest<Event>(page, url);
 
   expect(eventData.measurements).toBeDefined();
   expect(eventData.measurements?.ttfb?.value).toBeDefined();
+  // ttfb should be greater than 0 because of the `page.route` delay. We don't want to test
+  // the exact value here because it's not deterministic.
   expect(eventData.measurements?.ttfb?.value).toBeGreaterThan(0);
+
   expect(eventData.measurements?.['ttfb.requestTime']?.value).toBeDefined();
-  expect(eventData.measurements?.['ttfb.requestTime']?.value).toBeGreaterThan(0);
 });

From 154c251e6b6c80e729e30f82383fd3d377a369ca Mon Sep 17 00:00:00 2001
From: Abhijeet Prasad <aprasad@sentry.io>
Date: Mon, 18 Mar 2024 18:39:35 -0400
Subject: [PATCH 5/9] yarn fix

---
 .../suites/tracing/metrics/web-vitals-ttfb/test.ts          | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/dev-packages/browser-integration-tests/suites/tracing/metrics/web-vitals-ttfb/test.ts b/dev-packages/browser-integration-tests/suites/tracing/metrics/web-vitals-ttfb/test.ts
index 5bcab89447b5..95c7ea1155c9 100644
--- a/dev-packages/browser-integration-tests/suites/tracing/metrics/web-vitals-ttfb/test.ts
+++ b/dev-packages/browser-integration-tests/suites/tracing/metrics/web-vitals-ttfb/test.ts
@@ -9,9 +9,9 @@ sentryTest('should capture TTFB vital.', async ({ getLocalTestPath, page }) => {
     sentryTest.skip();
   }
 
-  page.route('**', async (route) => {
-    await new Promise((resolve) => setTimeout(resolve, 3000));
-    route.continue()
+  page.route('**', async route => {
+    await new Promise(resolve => setTimeout(resolve, 3000));
+    route.continue();
   });
 
   const url = await getLocalTestPath({ testDir: __dirname });

From ead53ecf2ec91f1ae5f320f727dc78be12ec082f Mon Sep 17 00:00:00 2001
From: Abhijeet Prasad <aprasad@sentry.io>
Date: Thu, 21 Mar 2024 11:44:03 -0400
Subject: [PATCH 6/9] fix tests

---
 .../assets/sentry-logo-600x179.png            | Bin 0 -> 16118 bytes
 .../metrics/web-vitals-ttfb/template.html     |   7 +++
 .../tracing/metrics/web-vitals-ttfb/test.ts   |   8 ++-
 .../src/browser/metrics/index.ts              |   6 +--
 yarn.lock                                     |  51 ++----------------
 5 files changed, 22 insertions(+), 50 deletions(-)
 create mode 100644 dev-packages/browser-integration-tests/suites/tracing/metrics/web-vitals-ttfb/assets/sentry-logo-600x179.png

diff --git a/dev-packages/browser-integration-tests/suites/tracing/metrics/web-vitals-ttfb/assets/sentry-logo-600x179.png b/dev-packages/browser-integration-tests/suites/tracing/metrics/web-vitals-ttfb/assets/sentry-logo-600x179.png
new file mode 100644
index 0000000000000000000000000000000000000000..353b7233d6bfa4f026f9998cacfa4add4bba9274
GIT binary patch
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HcmV?d00001

diff --git a/dev-packages/browser-integration-tests/suites/tracing/metrics/web-vitals-ttfb/template.html b/dev-packages/browser-integration-tests/suites/tracing/metrics/web-vitals-ttfb/template.html
index e98eee38c4e3..0604719239cd 100644
--- a/dev-packages/browser-integration-tests/suites/tracing/metrics/web-vitals-ttfb/template.html
+++ b/dev-packages/browser-integration-tests/suites/tracing/metrics/web-vitals-ttfb/template.html
@@ -2,6 +2,13 @@
 <html>
   <head>
     <meta charset="utf-8" />
+    <script>
+      // Simulate a long task to delay the TTFB
+      async function run() {
+        await fetch('https://example.com/path/to/image.png');
+      }
+      run();
+    </script>
   </head>
   <body>
     <div>Rendered</div>
diff --git a/dev-packages/browser-integration-tests/suites/tracing/metrics/web-vitals-ttfb/test.ts b/dev-packages/browser-integration-tests/suites/tracing/metrics/web-vitals-ttfb/test.ts
index 95c7ea1155c9..9e1f030f8c44 100644
--- a/dev-packages/browser-integration-tests/suites/tracing/metrics/web-vitals-ttfb/test.ts
+++ b/dev-packages/browser-integration-tests/suites/tracing/metrics/web-vitals-ttfb/test.ts
@@ -1,3 +1,4 @@
+import type { Route } from '@playwright/test';
 import { expect } from '@playwright/test';
 import type { Event } from '@sentry/types';
 
@@ -10,9 +11,14 @@ sentryTest('should capture TTFB vital.', async ({ getLocalTestPath, page }) => {
   }
 
   page.route('**', async route => {
-    await new Promise(resolve => setTimeout(resolve, 3000));
+    await new Promise(resolve => setTimeout(resolve, 1000));
     route.continue();
   });
+  page.route('**/path/to/image.png', async (route: Route) => {
+    // Simulate a delay in the response to make sure we capture the TTFB vital.
+    await new Promise(resolve => setTimeout(resolve, 1000));
+    return route.fulfill({ path: `${__dirname}/assets/sentry-logo-600x179.png` });
+  });
 
   const url = await getLocalTestPath({ testDir: __dirname });
   const eventData = await getFirstSentryEnvelopeRequest<Event>(page, url);
diff --git a/packages/tracing-internal/src/browser/metrics/index.ts b/packages/tracing-internal/src/browser/metrics/index.ts
index aae638a54c7e..e8c4730b67a8 100644
--- a/packages/tracing-internal/src/browser/metrics/index.ts
+++ b/packages/tracing-internal/src/browser/metrics/index.ts
@@ -544,10 +544,10 @@ function _addTtfbRequestTimeToMeasurements(_measurements: Measurements): void {
   const navEntry = getNavigationEntry() as TTFBMetric['entries'][number];
   const { responseStart, requestStart } = navEntry;
 
-  if (requestStart <= responseStart) {
-    DEBUG_BUILD && logger.log('[Measurements] Adding TTFB');
+  if (responseStart > requestStart) {
+    DEBUG_BUILD && logger.log('[Measurements] Adding TTFB Request Time');
     _measurements['ttfb.requestTime'] = {
-      value: (responseStart - requestStart) * 1000,
+      value: responseStart - requestStart,
       unit: 'millisecond',
     };
   }
diff --git a/yarn.lock b/yarn.lock
index 6644c3a1fca6..644e37903884 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -6712,17 +6712,7 @@
   dependencies:
     "@types/unist" "*"
 
-"@types/history-4@npm:@types/history@4.7.8":
-  version "4.7.8"
-  resolved "https://registry.yarnpkg.com/@types/history/-/history-4.7.8.tgz#49348387983075705fe8f4e02fb67f7daaec4934"
-  integrity sha512-S78QIYirQcUoo6UJZx9CSP0O2ix9IaeAXwQi26Rhr/+mg7qqPy8TzaxHSUut7eGjL8WmLccT7/MXf304WjqHcA==
-
-"@types/history-5@npm:@types/history@4.7.8":
-  version "4.7.8"
-  resolved "https://registry.yarnpkg.com/@types/history/-/history-4.7.8.tgz#49348387983075705fe8f4e02fb67f7daaec4934"
-  integrity sha512-S78QIYirQcUoo6UJZx9CSP0O2ix9IaeAXwQi26Rhr/+mg7qqPy8TzaxHSUut7eGjL8WmLccT7/MXf304WjqHcA==
-
-"@types/history@*":
+"@types/history-4@npm:@types/history@4.7.8", "@types/history-5@npm:@types/history@4.7.8", "@types/history@*":
   version "4.7.8"
   resolved "https://registry.yarnpkg.com/@types/history/-/history-4.7.8.tgz#49348387983075705fe8f4e02fb67f7daaec4934"
   integrity sha512-S78QIYirQcUoo6UJZx9CSP0O2ix9IaeAXwQi26Rhr/+mg7qqPy8TzaxHSUut7eGjL8WmLccT7/MXf304WjqHcA==
@@ -7112,15 +7102,7 @@
     "@types/history" "^3"
     "@types/react" "*"
 
-"@types/react-router-4@npm:@types/react-router@5.1.14":
-  version "5.1.14"
-  resolved "https://registry.yarnpkg.com/@types/react-router/-/react-router-5.1.14.tgz#e0442f4eb4c446541ad7435d44a97f8fe6df40da"
-  integrity sha512-LAJpqYUaCTMT2anZheoidiIymt8MuX286zoVFPM3DVb23aQBH0mAkFvzpd4LKqiolV8bBtZWT5Qp7hClCNDENw==
-  dependencies:
-    "@types/history" "*"
-    "@types/react" "*"
-
-"@types/react-router-5@npm:@types/react-router@5.1.14":
+"@types/react-router-4@npm:@types/react-router@5.1.14", "@types/react-router-5@npm:@types/react-router@5.1.14":
   version "5.1.14"
   resolved "https://registry.yarnpkg.com/@types/react-router/-/react-router-5.1.14.tgz#e0442f4eb4c446541ad7435d44a97f8fe6df40da"
   integrity sha512-LAJpqYUaCTMT2anZheoidiIymt8MuX286zoVFPM3DVb23aQBH0mAkFvzpd4LKqiolV8bBtZWT5Qp7hClCNDENw==
@@ -25305,7 +25287,7 @@ react-is@^18.0.0:
   dependencies:
     "@remix-run/router" "1.0.2"
 
-"react-router-6@npm:react-router@6.3.0":
+"react-router-6@npm:react-router@6.3.0", react-router@6.3.0:
   version "6.3.0"
   resolved "https://registry.yarnpkg.com/react-router/-/react-router-6.3.0.tgz#3970cc64b4cb4eae0c1ea5203a80334fdd175557"
   integrity sha512-7Wh1DzVQ+tlFjkeo+ujvjSqSJmkt1+8JO+T5xklPlgrh70y7ogx75ODRW0ThWhY7S+6yEDks8TYrtQe/aoboBQ==
@@ -25320,13 +25302,6 @@ react-router-dom@^6.2.2:
     history "^5.2.0"
     react-router "6.3.0"
 
-react-router@6.3.0:
-  version "6.3.0"
-  resolved "https://registry.yarnpkg.com/react-router/-/react-router-6.3.0.tgz#3970cc64b4cb4eae0c1ea5203a80334fdd175557"
-  integrity sha512-7Wh1DzVQ+tlFjkeo+ujvjSqSJmkt1+8JO+T5xklPlgrh70y7ogx75ODRW0ThWhY7S+6yEDks8TYrtQe/aoboBQ==
-  dependencies:
-    history "^5.2.0"
-
 react@^18.0.0:
   version "18.0.0"
   resolved "https://registry.yarnpkg.com/react/-/react-18.0.0.tgz#b468736d1f4a5891f38585ba8e8fb29f91c3cb96"
@@ -27806,7 +27781,7 @@ stringify-object@^3.2.1:
     is-obj "^1.0.1"
     is-regexp "^1.0.0"
 
-"strip-ansi-cjs@npm:strip-ansi@^6.0.1":
+"strip-ansi-cjs@npm:strip-ansi@^6.0.1", strip-ansi@^6.0.0, strip-ansi@^6.0.1:
   version "6.0.1"
   resolved "https://registry.yarnpkg.com/strip-ansi/-/strip-ansi-6.0.1.tgz#9e26c63d30f53443e9489495b2105d37b67a85d9"
   integrity sha512-Y38VPSHcqkFrCpFnQ9vuSXmquuv5oXOKpGeT6aGrr3o3Gc9AlVa6JBfUSOCnbxGGZF+/0ooI7KrPuUSztUdU5A==
@@ -27834,13 +27809,6 @@ strip-ansi@^5.1.0, strip-ansi@^5.2.0:
   dependencies:
     ansi-regex "^4.1.0"
 
-strip-ansi@^6.0.0, strip-ansi@^6.0.1:
-  version "6.0.1"
-  resolved "https://registry.yarnpkg.com/strip-ansi/-/strip-ansi-6.0.1.tgz#9e26c63d30f53443e9489495b2105d37b67a85d9"
-  integrity sha512-Y38VPSHcqkFrCpFnQ9vuSXmquuv5oXOKpGeT6aGrr3o3Gc9AlVa6JBfUSOCnbxGGZF+/0ooI7KrPuUSztUdU5A==
-  dependencies:
-    ansi-regex "^5.0.1"
-
 strip-ansi@^7.0.1:
   version "7.0.1"
   resolved "https://registry.yarnpkg.com/strip-ansi/-/strip-ansi-7.0.1.tgz#61740a08ce36b61e50e65653f07060d000975fb2"
@@ -30487,16 +30455,7 @@ workerpool@^6.4.0:
   resolved "https://registry.yarnpkg.com/workerpool/-/workerpool-6.4.0.tgz#f8d5cfb45fde32fa3b7af72ad617c3369567a462"
   integrity sha512-i3KR1mQMNwY2wx20ozq2EjISGtQWDIfV56We+yGJ5yDs8jTwQiLLaqHlkBHITlCuJnYlVRmXegxFxZg7gqI++A==
 
-"wrap-ansi-cjs@npm:wrap-ansi@^7.0.0":
-  version "7.0.0"
-  resolved "https://registry.yarnpkg.com/wrap-ansi/-/wrap-ansi-7.0.0.tgz#67e145cff510a6a6984bdf1152911d69d2eb9e43"
-  integrity sha512-YVGIj2kamLSTxw6NsZjoBxfSwsn0ycdesmc4p+Q21c5zPuZ1pl+NfxVdxPtdHvmNVOQ6XSYG4AUtyt/Fi7D16Q==
-  dependencies:
-    ansi-styles "^4.0.0"
-    string-width "^4.1.0"
-    strip-ansi "^6.0.0"
-
-wrap-ansi@7.0.0, wrap-ansi@^5.1.0, wrap-ansi@^6.2.0, wrap-ansi@^7.0.0, wrap-ansi@^8.1.0:
+"wrap-ansi-cjs@npm:wrap-ansi@^7.0.0", wrap-ansi@7.0.0, wrap-ansi@^5.1.0, wrap-ansi@^6.2.0, wrap-ansi@^7.0.0, wrap-ansi@^8.1.0:
   version "7.0.0"
   resolved "https://registry.yarnpkg.com/wrap-ansi/-/wrap-ansi-7.0.0.tgz#67e145cff510a6a6984bdf1152911d69d2eb9e43"
   integrity sha512-YVGIj2kamLSTxw6NsZjoBxfSwsn0ycdesmc4p+Q21c5zPuZ1pl+NfxVdxPtdHvmNVOQ6XSYG4AUtyt/Fi7D16Q==

From f288091e5191e38e44cee7dcbe571acd4ec5a4cf Mon Sep 17 00:00:00 2001
From: Abhijeet Prasad <aprasad@sentry.io>
Date: Thu, 21 Mar 2024 12:17:58 -0400
Subject: [PATCH 7/9] this

---
 packages/tracing-internal/src/browser/metrics/index.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/tracing-internal/src/browser/metrics/index.ts b/packages/tracing-internal/src/browser/metrics/index.ts
index e8c4730b67a8..364a1617112b 100644
--- a/packages/tracing-internal/src/browser/metrics/index.ts
+++ b/packages/tracing-internal/src/browser/metrics/index.ts
@@ -544,7 +544,7 @@ function _addTtfbRequestTimeToMeasurements(_measurements: Measurements): void {
   const navEntry = getNavigationEntry() as TTFBMetric['entries'][number];
   const { responseStart, requestStart } = navEntry;
 
-  if (responseStart > requestStart) {
+  if (requestStart <= responseStart) {
     DEBUG_BUILD && logger.log('[Measurements] Adding TTFB Request Time');
     _measurements['ttfb.requestTime'] = {
       value: responseStart - requestStart,

From 64fb9ce2a3df553479efb50f43dd6b38ba5759b6 Mon Sep 17 00:00:00 2001
From: Abhijeet Prasad <aprasad@sentry.io>
Date: Thu, 21 Mar 2024 12:49:18 -0400
Subject: [PATCH 8/9] nvm on test changes

---
 .../assets/sentry-logo-600x179.png              | Bin 16118 -> 0 bytes
 .../metrics/web-vitals-ttfb/template.html       |   7 -------
 .../tracing/metrics/web-vitals-ttfb/test.ts     |  14 --------------
 3 files changed, 21 deletions(-)
 delete mode 100644 dev-packages/browser-integration-tests/suites/tracing/metrics/web-vitals-ttfb/assets/sentry-logo-600x179.png

diff --git a/dev-packages/browser-integration-tests/suites/tracing/metrics/web-vitals-ttfb/assets/sentry-logo-600x179.png b/dev-packages/browser-integration-tests/suites/tracing/metrics/web-vitals-ttfb/assets/sentry-logo-600x179.png
deleted file mode 100644
index 353b7233d6bfa4f026f9998cacfa4add4bba9274..0000000000000000000000000000000000000000
GIT binary patch
literal 0
HcmV?d00001

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diff --git a/dev-packages/browser-integration-tests/suites/tracing/metrics/web-vitals-ttfb/template.html b/dev-packages/browser-integration-tests/suites/tracing/metrics/web-vitals-ttfb/template.html
index 0604719239cd..e98eee38c4e3 100644
--- a/dev-packages/browser-integration-tests/suites/tracing/metrics/web-vitals-ttfb/template.html
+++ b/dev-packages/browser-integration-tests/suites/tracing/metrics/web-vitals-ttfb/template.html
@@ -2,13 +2,6 @@
 <html>
   <head>
     <meta charset="utf-8" />
-    <script>
-      // Simulate a long task to delay the TTFB
-      async function run() {
-        await fetch('https://example.com/path/to/image.png');
-      }
-      run();
-    </script>
   </head>
   <body>
     <div>Rendered</div>
diff --git a/dev-packages/browser-integration-tests/suites/tracing/metrics/web-vitals-ttfb/test.ts b/dev-packages/browser-integration-tests/suites/tracing/metrics/web-vitals-ttfb/test.ts
index 9e1f030f8c44..3c7891afd6c4 100644
--- a/dev-packages/browser-integration-tests/suites/tracing/metrics/web-vitals-ttfb/test.ts
+++ b/dev-packages/browser-integration-tests/suites/tracing/metrics/web-vitals-ttfb/test.ts
@@ -10,24 +10,10 @@ sentryTest('should capture TTFB vital.', async ({ getLocalTestPath, page }) => {
     sentryTest.skip();
   }
 
-  page.route('**', async route => {
-    await new Promise(resolve => setTimeout(resolve, 1000));
-    route.continue();
-  });
-  page.route('**/path/to/image.png', async (route: Route) => {
-    // Simulate a delay in the response to make sure we capture the TTFB vital.
-    await new Promise(resolve => setTimeout(resolve, 1000));
-    return route.fulfill({ path: `${__dirname}/assets/sentry-logo-600x179.png` });
-  });
-
   const url = await getLocalTestPath({ testDir: __dirname });
   const eventData = await getFirstSentryEnvelopeRequest<Event>(page, url);
 
   expect(eventData.measurements).toBeDefined();
   expect(eventData.measurements?.ttfb?.value).toBeDefined();
-  // ttfb should be greater than 0 because of the `page.route` delay. We don't want to test
-  // the exact value here because it's not deterministic.
-  expect(eventData.measurements?.ttfb?.value).toBeGreaterThan(0);
-
   expect(eventData.measurements?.['ttfb.requestTime']?.value).toBeDefined();
 });

From 9fa501f3b0d6ff5f1fb308734e61ecfc4e94f002 Mon Sep 17 00:00:00 2001
From: Abhijeet Prasad <aprasad@sentry.io>
Date: Thu, 21 Mar 2024 12:49:51 -0400
Subject: [PATCH 9/9] fix

---
 .../suites/tracing/metrics/web-vitals-ttfb/test.ts               | 1 -
 1 file changed, 1 deletion(-)

diff --git a/dev-packages/browser-integration-tests/suites/tracing/metrics/web-vitals-ttfb/test.ts b/dev-packages/browser-integration-tests/suites/tracing/metrics/web-vitals-ttfb/test.ts
index 3c7891afd6c4..0a4b1e6d3da6 100644
--- a/dev-packages/browser-integration-tests/suites/tracing/metrics/web-vitals-ttfb/test.ts
+++ b/dev-packages/browser-integration-tests/suites/tracing/metrics/web-vitals-ttfb/test.ts
@@ -1,4 +1,3 @@
-import type { Route } from '@playwright/test';
 import { expect } from '@playwright/test';
 import type { Event } from '@sentry/types';