|Work with the Eucalyptus Management Console / Work with Auto Scaling Groups|
Auto Scaling uses CloudWatch alarms to trigger scaling actions. An alarm watches a single metric (for example: CPU utilization) over a time period you set, and performs one or more actions based on the value of the metric relative to a given threshold. CloudWatch alarms will not invoke actions just because they are in a particular state. For more information, see the Eucalyptus CloudWatch documentation in the Eucalyptus User Guide.