private String getRemoteAddress(Object remoteAddressFieldAccessor) {
                String remoteAddress = null;
                if (remoteAddressFieldAccessor instanceof RemoteAddressFieldAccessor) {
                    remoteAddress = ((RemoteAddressFieldAccessor) remoteAddressFieldAccessor)._$PINPOINT$_getRemoteAddress();
                }

                return StringUtils.defaultIfEmpty(remoteAddress, KafkaConstants.UNKNOWN);
            }
@author Taejin Koo
@author Victor.Zxy
agent-module/plugins/kafka/src/main/java/com/navercorp/pinpoint/plugin/kafka/interceptor/ConsumerRecordEntryPointInterceptor.java