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Amazon CloudWatch
User Guide

Amazon EC2 Auto Scaling Metrics and Dimensions

Amazon EC2 Auto Scaling sends metrics for instances and groups to CloudWatch. For Auto Scaling instances, you can enable detailed (one-minute) monitoring or basic (five-minute) monitoring. For Auto Scaling groups, you can enable group metrics. For more information, see Monitoring Your Auto Scaling Instances and Groups in the Amazon EC2 Auto Scaling User Guide.

Auto Scaling Group Metrics

If you enable group metrics, Amazon EC2 Auto Scaling sends aggregated data to CloudWatch every minute.

The AWS/AutoScaling namespace includes the following metrics.

Metric Description
GroupMinSize

The minimum size of the Auto Scaling group.

GroupMaxSize

The maximum size of the Auto Scaling group.

GroupDesiredCapacity

The number of instances that the Auto Scaling group attempts to maintain.

GroupInServiceInstances

The number of instances that are running as part of the Auto Scaling group. This metric does not include instances that are pending or terminating.

GroupPendingInstances

The number of instances that are pending. A pending instance is not yet in service. This metric does not include instances that are in service or terminating.

GroupStandbyInstances

The number of instances that are in a Standby state. Instances in this state are still running but are not actively in service.

GroupTerminatingInstances

The number of instances that are in the process of terminating. This metric does not include instances that are in service or pending.

GroupTotalInstances

The total number of instances in the Auto Scaling group. This metric identifies the number of instances that are in service, pending, and terminating.

Dimensions for Auto Scaling Group Metrics

To filter the metrics for your Auto Scaling group by group name, use the AutoScalingGroupName dimension.