feat(browser)!: Extract web vitals into dedicated webVitalsIntegration

Moves LCP, CLS and INP tracking out of `browserTracingIntegration` into a new
standalone `webVitalsIntegration`. `browserTracingIntegration` auto-registers
it (in `afterAllSetup`) when the user hasn't supplied one, so default behavior
is preserved.

Also removes the v1 standalone span envelope path entirely:
- `trackLcpAsStandaloneSpan`, `trackClsAsStandaloneSpan`, `startTrackingINP`
  and `_onInp` are gone from `@sentry-internal/browser-utils`
- `startStandaloneWebVitalSpan` is deleted (no remaining callers)
- `SentrySpan#_isStandaloneSpan`, `SentrySpan#isStandaloneSpan()` and the
  standalone send branch in `_onSpanEnded` are removed
- `createSpanEnvelope` and the local `sendSpanEnvelope` helper are deleted
- `SpanContext.isStandalone` and `StartSpanOptions.experimental.standalone`
  are removed from the public types
- `enableInp` option on `browserTracingIntegration` is removed (migrate to
  `webVitalsIntegration({ disable: ['inp'] })`)
- `_experiments.enableStandaloneClsSpans` and
  `_experiments.enableStandaloneLcpSpans` are removed

Streamed spans are unaffected: they use `createStreamedSpanEnvelope`,
`SpanBuffer`, and the `afterSegmentSpanEnd` hook, all of which are intact.

Co-Authored-By: Claude Opus 4.7 (1M context) <[email protected]>

Author: logaretm

CHANGELOG.md

@@ -2,7 +2,14 @@
 
 ## Unreleased
 
-- "You miss 100 percent of the chances you don't take. — Wayne Gretzky" — Michael Scott
+- **feat(browser)!: Extract Web Vitals into a dedicated `webVitalsIntegration` (v11)**
+
+  Web vital tracking (LCP, CLS, INP) has been extracted out of `browserTracingIntegration` into a new standalone `webVitalsIntegration`. `browserTracingIntegration` auto-registers it by default, so no migration is required for the common case.
+
+  Breaking changes:
+  - `enableInp` option on `browserTracingIntegration` has been removed. To disable INP, register `webVitalsIntegration({ disable: ['inp'] })` alongside `browserTracingIntegration`.
+  - `_experiments.enableStandaloneClsSpans` and `_experiments.enableStandaloneLcpSpans` have been removed; the v1 standalone web vital span path no longer exists.
+  - The internal standalone span envelope path (`SpanContext.isStandalone`, `experimental.standalone` on `StartSpanOptions`, `createSpanEnvelope`, `SentrySpan#isStandaloneSpan`) has been removed. Web vitals now flow through the v2 streamed span pipeline exclusively.
 
 ## 10.51.0
 

dev-packages/browser-integration-tests/suites/tracing/browserTracingIntegration/linked-traces-streamed/consistent-sampling/tracesSampler-precedence/init.js

@@ -5,10 +5,10 @@ window.Sentry = Sentry;
 Sentry.init({
   dsn: 'https://[email protected]/1337',
   integrations: [
+    Sentry.webVitalsIntegration({ disable: ['inp'] }),
     Sentry.browserTracingIntegration({
       linkPreviousTrace: 'in-memory',
       consistentTraceSampling: true,
-      enableInp: false,
     }),
     Sentry.spanStreamingIntegration(),
   ],

dev-packages/browser-integration-tests/suites/tracing/browserTracingIntegration/linked-traces/consistent-sampling/tracesSampler-precedence/init.js

@@ -5,10 +5,10 @@ window.Sentry = Sentry;
 Sentry.init({
   dsn: 'https://[email protected]/1337',
   integrations: [
+    Sentry.webVitalsIntegration({ disable: ['inp'] }),
     Sentry.browserTracingIntegration({
       linkPreviousTrace: 'in-memory',
       consistentTraceSampling: true,
-      enableInp: false,
     }),
   ],
   tracePropagationTargets: ['sentry-test-external.io'],

dev-packages/browser-integration-tests/suites/tracing/browserTracingIntegration/long-animation-frame-before-navigation-streamed/init.js

@@ -5,11 +5,11 @@ window.Sentry = Sentry;
 Sentry.init({
   dsn: 'https://[email protected]/1337',
   integrations: [
+    Sentry.webVitalsIntegration({ disable: ['inp'] }),
     Sentry.browserTracingIntegration({
       enableLongTask: false,
       enableLongAnimationFrame: true,
       instrumentPageLoad: false,
-      enableInp: false,
     }),
     Sentry.spanStreamingIntegration(),
   ],

dev-packages/browser-integration-tests/suites/tracing/browserTracingIntegration/long-animation-frame-before-navigation/init.js

@@ -5,11 +5,11 @@ window.Sentry = Sentry;
 Sentry.init({
   dsn: 'https://[email protected]/1337',
   integrations: [
+    Sentry.webVitalsIntegration({ disable: ['inp'] }),
     Sentry.browserTracingIntegration({
       enableLongTask: false,
       enableLongAnimationFrame: true,
       instrumentPageLoad: false,
-      enableInp: false,
     }),
   ],
   tracesSampleRate: 1,

dev-packages/browser-integration-tests/suites/tracing/browserTracingIntegration/long-tasks-before-navigation-streamed/init.js

@@ -5,11 +5,11 @@ window.Sentry = Sentry;
 Sentry.init({
   dsn: 'https://[email protected]/1337',
   integrations: [
+    Sentry.webVitalsIntegration({ disable: ['inp'] }),
     Sentry.browserTracingIntegration({
       enableLongAnimationFrame: false,
       instrumentPageLoad: false,
       instrumentNavigation: true,
-      enableInp: false,
       enableLongTask: true,
     }),
     Sentry.spanStreamingIntegration(),

dev-packages/browser-integration-tests/suites/tracing/browserTracingIntegration/long-tasks-before-navigation/init.js

@@ -5,11 +5,11 @@ window.Sentry = Sentry;
 Sentry.init({
   dsn: 'https://[email protected]/1337',
   integrations: [
+    Sentry.webVitalsIntegration({ disable: ['inp'] }),
     Sentry.browserTracingIntegration({
       enableLongAnimationFrame: false,
       instrumentPageLoad: false,
       instrumentNavigation: true,
-      enableInp: false,
       enableLongTask: true,
     }),
   ],