Exposing tracer property on spans

[hekike]

Span has a private tracer property, NoRecordSpan doesn't. I'd prefer to make tracer always available on Span like in OpenTracing. Coming from OpenTracing, I found it challenging not having tracer available on spans, especially that first I assumed it is and started to use it, then my code broke one NoRecordSpan(s).

[SergeyKanzhelev]

What do you need a tracer for? Is it because multiple apps can be hosted in a single process and you need app-specific tracer? Or because of this: census-instrumentation/opencensus-specs#249 - ability to restore the scope without holding on to scope object?

[hekike]

None of them. We prefer manual instrumentation without CLS overhead and it’s easier to start a child span if we don’t need to pass both tracer and root span around. Alternative could be:
span.startChildSpan().startChildSpan()...

[mayurkale22]

Closing via open-telemetry/opentelemetry-specification#21