code: protected void printDead(String interfaceId, ProviderInfo providerInfo, ClientTransport transport, Exception e) {
          Throwable cause = e.getCause();
          if (LOGGER.isWarnEnabled(consumerConfig.getAppName())) {
              LOGGER.warnWithApp(consumerConfig.getAppName(),
                  "Connect to {} provider:{} failure !! The exception is " + ExceptionUtils.toShortString(e, 1)
                      + (cause != null ? ", cause by " + cause.getMessage() + "." : "."),
                  interfaceId, providerInfo);
          }
      }
docs: 打印连不上日志
  
  @param interfaceId  接口名称
  @param providerInfo 服务端
  @param transport    连接
  @param e            错误