MuAnswer

Results 2 issues of MuAnswer

[Question] <The collection interval is not absolutely 30s>

### Question 阅读源码，发现指标时间是客户端调度时间， ![lQLPKGrR_pMoh4PNAbvNA6GwtINrtJeKZTYGkS_sHMOkAA_929_443](https://github.com/user-attachments/assets/a9b44fb5-602f-44d4-97e1-c5614bbee77f) 目前场景会发现，每30s会产生1s的误差，以至于测试数据一直有周期性毛刺。下图：脚本每分钟两次写入，分别是3跟2值是5才是正确的 ![QQ图片20240729194749](https://github.com/user-attachments/assets/c2e5e1b0-2bc9-4512-83d4-4484a76b602e)

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[Question] <Custom metrics collect time>

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### Question hertzbeat目前可以支持自定义exporter指定指标时间吗？查看源码貌似没有接受自定义时间

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