propogating both tracecontext and baggage requires custom code

[rbtcollins]

As I understand it tracecontext and baggage are complementary, but today the documented idiom here is

(from https://docs.rs/opentelemetry/latest/opentelemetry/global/fn.set_text_map_propagator.html)

global::set_text_map_propagator(TraceContextPropagator::new());

however, tracecontext and baggage are meant to both be used together e.g. https://medium.com/jaegertracing/embracing-context-propagation-7100b9b6029a and w3c/baggage#10 (comment)
and also https://w3c.github.io/baggage/#baggage-http-header-format - SHOULD be passed on - means that having to write a Composite Propogator by hand is needed.

[rbtcollins]

nevermind, I just did not manage to find it in the docs. :/