src/client/pkg/tracing/tracing.go
func UnaryClientInterceptor() grpc.UnaryClientInterceptor {
	return otgrpc.OpenTracingClientInterceptor(opentracing.GlobalTracer(),
		otgrpc.IncludingSpans(addTraceIfTracingEnabled))
}
func UnaryClientInterceptor() grpc.UnaryClientInterceptor {
	return otgrpc.OpenTracingClientInterceptor(opentracing.GlobalTracer(),
		otgrpc.IncludingSpans(addTraceIfTracingEnabled))
}
// UnaryClientInterceptor returns a GRPC interceptor for non-streaming GRPC RPCs