On warm-started workers with `processKeepAlive` enabled, every run's
attempt span was exported with the first run's `traceId` and
`parentSpanId`. `ExternalSpanExporterWrapper` and
`ExternalLogRecordExporterWrapper` captured `externalTraceContext` at
`TracingSDK` construction, and the SDK is memoized for the worker's
lifetime - so the per-run reset of
`StandardTraceContextManager.traceContext` never reached the wrappers.
Reported by a customer running v4.4.x: 33 distinct runs on the same
host/pid showed up in their APM as siblings of one parent span.
Fix: the wrappers now read external context live from the trace context
manager per export. Runs without an external trace context fall through
to the unchanged `externalTraceId` fallback - no behaviour change for
them.
Regression test in
`packages/core/test/externalSpanExporterWrapper.test.ts` asserts that
reassigning the manager between exports produces correctly-parented
spans.
nicktrn
c043c4a6ad