private void closeSpan(ServiceRequestContext ctx, ServerSpan serverSpan, RequestLog req, O res) {
   if (req.hasAttr(RequestLog.RPC_REQUEST)) {
     serverSpan.getSpan().setName(req.attr(RequestLog.RPC_REQUEST).get().method());
   }
   serverInterceptor.closeSpan(serverSpan, createResponseAdapter(ctx, req, res));
 }