The list with default alarm definitions in the next version of ESX server has grown tremendously. As you can see in the image the list contains a a lot of new trigger objects. You can monitor the current condition or state of virtual machines, hosts, and datastores. This includes power states, connection states, and performance metrics, such as CPU and disk usage. To set alarms on other objects in the inventory, including datacenters, clusters, resource pools, and networking objects, use event triggers. The Event Triggers monitors events that occur in response to operations occurring with any managed object in the inventory, the vCenter Server system, or the license server. For example, an event is recorded each time a virtual machine is cloned, created, deleted, deployed, and migrated.
In the Alarm Settings dialog box, use the Triggers tab to add, edit, or remove alarm triggers. The procedure for setting up triggers depends on whether you are setting the trigger for a condition or state or for an event. What’s new... you can set a condition length.