A notification is an email, page or SNMP trap that is generated when a host changes its state or when a service check has exceeded the configured thresholds.

Notifications are sent via three modes of communication: e-mail, SNMP trap, and pager. These can be acknowledged via e-mail. Only e-mail and pager notifications require acknowledgement, as SNMP traps do not participate in the escalation process.

If the notification arrived via e-mail, simply click on reply in the mail application and put ACK [Send ID] or NACK [Send ID] in the body or subject line of the message. The NACK response causes the alerting engine to automatically escalate to the next person on the list regardless of Acknowledge Wait Times. The Send ID needs to be known in order to acknowledge the alert in this fashion. This right-character set can be found in the body of the notification.

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原文链接: http://www.redhatmagazine.com/2008/01/21/tips-and-tricks-what-is-a-command-center-notification-and-how-can-i-acknowledge-a-notification/