[Question] Monitoring status has not changed

### Question

某一个监控的连接已经断了，但是监控页面状态还是可用状态一直没变。之前有人提过类似问题，原因是没有默认可用性告警。我这边是创建了默认可用性告警的，只是没有发出告警(原因是该监控虽然状态是可用的，但是并没有去跑任务)。所以有两个问题：
1、连接已经断了，状态迟迟没变，正常情况下监控状态应该变成不可用
2、就算状态没变，还是可用状态，为什么没有去跑对应的任务

No files, tests, or entry points are named. Start by reproducing the disconnected-monitor case and trace why its status remains available, why its task is not run, and why the default availability alert is not emitted; done means both reported behaviors have an explained and verified outcome.

Written by the indexing model from the issue text.