Propagation of Tracer

[kylepl]

I'm currently making use of Tracer, creating Spans, and using WithActiveSpan.

Currently I'm manually propagating a Tracer instance around - one that is actually used for my entire HTTP server, between functions that need to create Spans. Is this the expected way to do it? While I can get the current span without it, it wasn't clear to me how to get the tracer - or what happens if you mix tracers.