Update Manager downloads all notifications that are available on the VMware Web site. Some notifications can trigger an alarm. By using the Alarm Definitions wizard, you can configure automated actions to be taken when an alarm is triggered.

Notifications appear in the Notifications tab that is located under the Monitor tab in the Update Manager Admin View.

Information notifications
Information notifications do not trigger an alarm. Clicking an information notification opens the Notification Details window.
Warning notifications
Warning notifications trigger an alarm, which appears in the vSphere Web Client Alarms pane. Warning notifications are typically fixes for patch recalls. Clicking a warning notification opens the Patch Recall Details window.
Alert notifications
Alert notifications trigger an alarm, which appears in the vSphere Web Client Alarms pane. Alert notifications are typically patch recalls. Clicking an alert notification opens the Patch Recall Details window.