Is your feature request related to a problem? (你需要的功能是否与某个问题有关?)
常规的固定backup_request的time，有可能引起雪崩
Describe the solution you'd like (描述你期望的解决方法)
根据latency的分位值设置触发backup_request的时间，同时提供一个熔断阈值，大于阈值时，不再触发backup_request
Describe alternatives you've considered (描述你想到的折衷方案)
Additional context/screenshots (更多上下文/截图)
Is your feature request related to a problem? (你需要的功能是否与某个问题有关?)
常规的固定backup_request的time，有可能引起雪崩
Describe the solution you'd like (描述你期望的解决方法)
根据latency的分位值设置触发backup_request的时间，同时提供一个熔断阈值，大于阈值时，不再触发backup_request
Describe alternatives you've considered (描述你想到的折衷方案)
Additional context/screenshots (更多上下文/截图)