feat(browser): Emit web vitals as streamed spans#19827

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logaretm wants to merge 9 commits intolms/feat-span-firstfrom

awad/js-17931-webvitals-v2-spans

Commits on Mar 23, 2026

feat(browser-utils): Add FCP instrumentation handler and export INP_ENTRY_MAP

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feat(browser): Emit web vitals as streamed spans when span streaming is enabled

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test(browser): Add integration tests for streamed web vital spans

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fix(browser): Only emit LCP, CLS, INP as streamed spans; disable standalone spans when streaming

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fix(browser): Add MAX_PLAUSIBLE_INP_DURATION check to streamed INP span path

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fix(browser): Prevent duplicate INP spans when span streaming is enabled

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fix(browser-utils): Remove dead FCP instrumentation code

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fix(browser-utils): Add fallback for browserPerformanceTimeOrigin in _sendInpSpan

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fix(browser-utils): Cache browserPerformanceTimeOrigin call in _sendLcpSpan

logaretm
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