ExportComponentImpl that has valid instances for RunningSpanStore
and SampledSpanStore.ExportComponentImpl that has null instances for RunningSpanStore and SampledSpanStore.ExportComponent.System.nanoTime()).MillisClock.Span in nanos.Span.Span.Span from the running spans list when the Span ends.Span into the running spans list when the Span starts.PropagationComponent.RunningSpanStore.SampledSpanStore.SampledSpanStoreImpl.SpanExporter.Span class.Span only when the Span
has Options#RECORD_EVENTS option.EventQueue to defer processing/exporting of the SpanData to
avoid impacting the critical path.StartEndHandlerImpl.Span.TraceConfigImpl.