如果超过了该阈值，则会向通知列表发送警报。
If this threshold is exceeded, an alert is sent to the notification list.
healthcheck输出的通知列表包含以下内容。
The healthcheck output to the notification list includes the following.
目前这个项目已经满座了，但你可以点击这里查看通知列表，看看它再开班的日期。
The program is currently sold out, but you can go here to get on the announcement list for when it reopens.
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