The purpose of alerting is to speed the process of detecting and resolving problems. Rapid detection and response can be compromised when multiple alerts fire as a result of the same problem, or if responders are inundated by repetitive alert notifications.

Excessive alert and notification are less likely when:

A given problem or root cause results in one, rather than many, alerts.

An alert status of "unfixed" indicates a problem that still exists and needs attention, rather than a transient issue that occurred, and then went away.

A single problem doesn't result in a firestorm of redundant notifications.

When the volume of fired alerts is high, prioritizing and resolving problems is harder.

If the volume of notifications exceeds manageable levels you can disable alert notifications globally.

You can extend the reach of hierarchical alerting beyond the basic platform-server-service hierarchy to top level platforms - network devices or virtual hosts upon which operating system platforms depend.

You can configure the vCenter Hyperic server to throttle back alert notifications in the event of an alert storm.