第三个 Gadget 是警报通知器，如图 8 所示，当您创建此 Gadget 的实例时，所显示的警报列表将定期更新，以便您通过新的警报获得通知。
The third gadget is the alert notifier, shown in Figure 8. When you create an instance of this gadget, the list of alerts shown is periodically updated so that you get notified with new alerts.
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.
除了这些内置警报，还可以通过订阅错误条件列表或配合使用日志系统来生成定制警报。
In addition to the built-in alerts, custom alerts may be generated by subscribing to a list of error conditions or in conjunction with the logging system.
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