Add Opentracing to diffy.

[flouthoc]

Hi Team,
I would like to request open tracing like feature request for diffy which could dig further into the microservices pipeline and highlight the exact point causing the difference.

[puneetkhanduri]

This is outside the scope of Diffy as it works purely as a network proxy while distributed tracing (like OpenTracing implementations) requires context propagation at the service framework level. We have a different project called Isotope that enables this. You are welcome to apply for beta access here

[flouthoc]

@puneetkhanduri Thanks for the isotope access.