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ref(browser-utils): Align standalone LCP span attribute setting with pageload span LCP attributes #16844

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Merged
merged 3 commits into from
Jul 9, 2025
Merged

ref(browser-utils): Align standalone LCP span attribute setting with pageload span LCP attributes #16844

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8008d2b
ref(browser-utils): Align standalone LCP span attribute setting with …
Lms24 Jul 8, 2025
84630a3
fix size
Lms24 Jul 8, 2025
9d48700
fix integration, add unit test
Lms24 Jul 8, 2025
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21 changes: 15 additions & 6 deletions packages/browser-utils/src/metrics/lcp.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -105,12 +105,21 @@ function sendStandaloneLcpSpan(lcpValue: number, entry: LargestContentfulPaint |
};

if (entry) {
attributes['lcp.element'] = htmlTreeAsString(entry.element);
attributes['lcp.id'] = entry.id;
attributes['lcp.url'] = entry.url;
attributes['lcp.loadTime'] = entry.loadTime;
attributes['lcp.renderTime'] = entry.renderTime;
attributes['lcp.size'] = entry.size;
entry.element && (attributes['lcp.element'] = htmlTreeAsString(entry.element));
entry.id && (attributes['lcp.id'] = entry.id);

// Trim URL to the first 200 characters.
entry.url && (attributes['lcp.url'] = entry.url.trim().slice(0, 200));

// loadTime is the time of LCP that's related to receiving the LCP element response..
entry.loadTime != null && (attributes['lcp.loadTime'] = entry.loadTime);

// renderTime is loadTime + rendering time
// it's 0 if the LCP element is loaded from a 3rd party origin that doesn't send the
// `Timing-Allow-Origin` header.
entry.renderTime != null && (attributes['lcp.renderTime'] = entry.renderTime);

entry.size != null && (attributes['lcp.size'] = entry.size);
}

const span = startStandaloneWebVitalSpan({
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