alibaba / alibaba/Sentinel

在熔断控制-慢调用比例的降级规则, 是否也应对业务调用异常进行统计?

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Description

## 慢调用比例规则增加对异常的统计

Type: *bug report* or *feature request*

### Describe what happened (or what feature you want)
当前,针对某个资源配置了慢调用比例降级规则, 如果在调用时发生异常,但rt小于设置的阈值时,不会发生熔断.
在通常的业务场景下, 针对这种情况就需要配置两类规则,在资源数量比较多的情况下, 配置很麻烦.

### Describe what you expected to happen

是否该将此类业务调用异常加入到慢调用比例的触发条件中, 即发生异常但未到设置的RT阈值时,仍然记录为慢调用?

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