public StringBuilder adminDelDefFlowControlRule(HttpServletRequest req,
            StringBuilder sBuffer,
            ProcessResult result) {
        // check and get operation info
        if (!WebParameterUtils.getAUDBaseInfo(req, false, null, sBuffer, result)) {
            WebParameterUtils.buildFailResult(sBuffer, result.getErrMsg());
            return sBuffer;
        }
        BaseEntity opEntity = (BaseEntity) result.getRetData();
        // add or modify record
        if (!defMetaDataService.addOrUpdClusterDefSetting(opEntity,
                TBaseConstants.META_VALUE_UNDEFINED, TBaseConstants.META_VALUE_UNDEFINED,
                TBaseConstants.META_VALUE_UNDEFINED, TBaseConstants.META_VALUE_UNDEFINED,
                TBaseConstants.META_VALUE_UNDEFINED, EnableStatus.STATUS_DISABLE, 0,
                TServerConstants.BLANK_FLOWCTRL_RULES, null, sBuffer, result)) {
            WebParameterUtils.buildFailResult(sBuffer, result.getErrMsg());
            return sBuffer;
        }
        return buildRetInfo(sBuffer, false);
    }
delete flow control rule

@param req       Http Servlet Request
@param sBuffer   string buffer
@param result    process result
@return    process result
inlong-tubemq/tubemq-server/src/main/java/org/apache/inlong/tubemq/server/master/web/handler/WebMasterInfoHandler.java