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RUM-9023 use session id to sample network traces #844

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Merged
xgouchet merged 1 commit into from
Apr 15, 2025
Merged

RUM-9023 use session id to sample network traces #844

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7 changes: 6 additions & 1 deletion ...s/core/src/rum/instrumentation/resourceTracking/distributedTracing/distributedTracing.tsx
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Original file line number Diff line number Diff line change
Expand Up @@ -77,7 +77,12 @@ export const generateTracingAttributesWithSampling = (
}

const traceId = TracingIdentifier.createTraceId();
const hash = Number(traceId.id.multiply(knuthFactor).remainder(twoPow64));
// for a UUID with value aaaaaaaa-bbbb-Mccc-Nddd-1234567890ab
// we use as the input id the last part : 0x1234567890ab
const baseId = rumSessionId
? BigInt(rumSessionId.split('-')[4], 16)
: traceId.id;
const hash = Number(baseId.multiply(knuthFactor).remainder(twoPow64));
const threshold = (tracingSamplingRate / 100) * Number(twoPow64);
const isSampled = hash <= threshold;

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