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