Alarm trigger types
During the alarm creation, you are required to specify alarm triggers that will generate an alert when a certain criteria is met. These two types of alarm triggers are available in vSphere:
1. condition or state triggers – monitor the current condition or state of an ESXi host, VM, or datastore, including power states, connection states, and performance metrics. Examples of such triggers are triggers that generate an alert when a VM’s snapshot is above a certain size, an ESXi host is using 90% of its memory, or a datastore has been disconnected.
2. event triggers – monitor events that occur in response to operations occuring with a vCenter Server object, such as events when an ESXi host’s hardware health changes or a license expires. Triggers of this type use arguments, operators, and values to identify when to trigger an alert.