AlarmExpression Types

By using the appropriate type of AlarmExpression, you can set alarms for different conditions, states, or events.

AlarmExpression	Description	Example
StateAlarmExpression	Specifies thresholds that trigger the alarm.	Triggered by a power state change of a virtual machine or state change of a distributed virtual switch.
MetricAlarmExpression	Specifies levels at which the alarm changes state. See Using MetricAlarmExpression.	Triggered when resource utilization metrics exceed a specified limit.
EventAlarmExpression	Specifies a type of event as the basis for the alarm.	Triggered by power on or power off events of primary or secondary virtual machines in a fault-tolerant cluster.
EventAlarmComparison	Specifies the property of the Event that should trigger the alarm and the operator to use as the basis for comparison.
AndAlarmExpression OrAlarmExpression	Combines one or more instances of the AndAlarmExpression and the OrAlarmExpression data objects into an expression that evaluates to true or false.