Add trace spans for client

[geeknoid]

@douglas-reid commented on Mon Jan 29 2018

For the distributed tracing features of Istio, we want to have mixerclient spans in the generated trace data. This would help with a number of debug-ability related items:

• better understanding caching
• better understanding perf of client library
• better understanding impact of network

cc: @rshriram

[howardjohn]

Is this still relevant? Given no comments in almost 2 years I would guess not?

[douglas-reid]

I think the need is still valid, but the likelihood of the work actually being conducted and used is so small as not really be useful or relevant. Let's close this as: Won't Fix.