return xtrace metadata from start_trace
return xtrace metadata from start_trace

Used to pass inject into response of RPC call

tlunter/oboe-ruby,appneta/ruby-traceview,appneta/ruby-traceview,boyang-li/oboe-ruby,tlunter/oboe-ruby,boyang-li/oboe-ruby,boyang-li/oboe-ruby,boyang-li/oboe-ruby,tlunter/oboe-ruby,appneta/ruby-traceview,appneta/ruby-traceview,tlunter/oboe-ruby