Function createBusinessSpanSampler

apps/sim/instrumentation-node.ts:188–226

(rootRatioSampler: Sampler)

    // parents, and re-samples business roots fresh (don't delegate to
    // ParentBased — its unsampled-parent path is AlwaysOff by default).
    const createBusinessSpanSampler = (rootRatioSampler: Sampler): Sampler => ({
      shouldSample(
        context: Context,
        traceId: string,
        spanName: string,
        spanKind: SpanKind,
        attributes: Attributes,
        links: Link[]
      ): SamplingResult {
        if (attributes['next.span_type']) {
          return { decision: SamplingDecision.NOT_RECORD }
        }

        const parentSpanContext = trace.getSpanContext(context)
        const parentIsSampled =
          !!parentSpanContext &&
          (parentSpanContext.traceFlags & TraceFlags.SAMPLED) === TraceFlags.SAMPLED

        if (parentIsSampled) {
          return { decision: SamplingDecision.RECORD_AND_SAMPLED }
        }

        if (isBusinessSpan(spanName)) {
          return rootRatioSampler.shouldSample(
            context,
            traceId,
            spanName,
            spanKind,
            attributes,
            links
          )
        }

        return { decision: SamplingDecision.NOT_RECORD }
      },
      toString(): string {
        return `BusinessSpanSampler{rootSampler=${rootRatioSampler.toString()}}`
      },
    })

    const otlpHeaders = parseOtlpHeaders(process.env.OTEL_EXPORTER_OTLP_HEADERS || '')
    const exporterUrl = normalizeOtlpTracesUrl(telemetryConfig.endpoint)