管理端默认下发配置有四个多余项。

agent在加载云端下发的配置的时，每次包含如下四个配置项：fileleak_scan.name、fileleak_scan.interval、fileleak_scan.limit、log.maxstack，查看agent相关源码发现Configitem枚举类中也没有对应配置的定义，这四个配置项是mongo中app表默认就有的，在通用设置页面上也用到了其中后三个作为设置项。
问题：这四个默认自带的多余配置项，导致在本地日志或者在ES的error索引里可以看到大量比如“unknown config key fileleak_scan.name found in cloud configuration”这样的信息。
想确认下这四个配置项对应的实际功能在agent中是否并实现了或者后续是否有开发计划，删掉mongo中对应的默认配置对agent功能是否会有影响。

Trace the agent's Configitem enum and the default entries in the MongoDB app table, then compare them with the common settings page and cloud-configuration handling. Determine whether these four settings are implemented or planned and whether removing the defaults is safe. Done means the unknown-key errors and configuration behavior are addressed with a confirmed decision.

Written by the indexing model from the issue text.