OpenTelemetry: Return null when getting a missing header #662
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If the Propagator expects a header which is missing from the kernel, it catches the `NoSuchElementException`, silently fails the propagation, and instead generates a new trace ID. ``` java.util.NoSuchElementException: key not found: baggage at scala.collection.immutable.Map$Map2.apply(Map.scala:298) at natchez.opentelemetry.OpenTelemetrySpan$$anon$1.get(OpenTelemetrySpan.scala:168) at natchez.opentelemetry.OpenTelemetrySpan$$anon$1.get(OpenTelemetrySpan.scala:167) at io.opentelemetry.api.baggage.propagation.W3CBaggagePropagator.extract(W3CBaggagePropagator.java:98) at io.opentelemetry.context.propagation.MultiTextMapPropagator.extract(MultiTextMapPropagator.java:65) at natchez.opentelemetry.OpenTelemetrySpan$.fromKernel$$anonfun$1(OpenTelemetrySpan.scala:142) at cats.effect.IOFiber.runLoop(IOFiber.scala:335) at cats.effect.IOFiber.asyncContinueSuccessfulR(IOFiber.scala:1322) at cats.effect.IOFiber.run(IOFiber.scala:119) at cats.effect.unsafe.WorkerThread.run(WorkerThread.scala:585) ``` The OpenTelemetry propagators expect either `null` or empty string when a header is missing.
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If the Propagator expects a header which is missing from the kernel, it catches the
NoSuchElementException, silently fails the propagation, and instead generates a new trace ID.The OpenTelemetry propagators expect either
nullor empty string when a header is missing.