baggage propagation

[AgraVator]

No description provided.

[ejona86]

The issue was that it didn't propagate to metrics... but you don't test metrics. I'd expect changes to

grpc-java/opentelemetry/src/main/java/io/grpc/opentelemetry/OpenTelemetryMetricsModule.java

Line 131 in 0567531

private static final class ClientTracer extends ClientStreamTracer {

This can be considered a good step, as it is now propagated to the application. Basically, when you say "propagation" you need to say what you are propagating to. But this would only be one part of what had been discussed earlier. (And this can go in before the rest of the metrics is working.)