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You can use the AWS Management Console, the mon-list-metrics command, or the ListMetrics API to determine which metrics are available.
To display available metrics across multiple instances
Open the Amazon CloudWatch console at https://console.aws.amazon.com/cloudwatch/.
In the Navigation pane, click Metrics.
The Metrics page opens.

Scroll down to view the full list of metrics.
To list available metrics across multiple instances
Enter the mon-list-metrics command.
Add the --headers parameter to display column headings.
Prompt>mon-list-metrics --headersAmazon CloudWatch returns the following (partial listing):
Metric Name Namespace Dimensions
CPUUtilization AWS/EC2 {InstanceId=i-5431413d}
CPUUtilization AWS/EC2 {InstanceId=i-d43242bd}
CPUUtilization AWS/EC2 {InstanceId=i-1d3d4d74}
CPUUtilization AWS/EC2 {InstanceId=i-78314111}
CPUUtilization AWS/EC2 {InstanceId=i-d3c8baba}
CPUUtilization AWS/EC2 {InstanceId=i-0d334364}
CPUUtilization AWS/EC2 {InstanceId=i-6732420e}
CPUUtilization AWS/EC2 {InstanceId=i-d93141b0}
CPUUtilization AWS/EC2 {InstanceId=i-e03d4d89}
CPUUtilization AWS/EC2 {InstanceId=i-c93d4da0}
CPUUtilization AWS/EC2 {InstanceId=i-e0304089}
CPUUtilization AWS/EC2 {InstanceId=i-e1304088}
CPUUtilization AWS/EC2 {InstanceId=i-69334300}To determine available metrics across multiple instances
Call ListMetrics to generate a list of all of your valid metrics.
This returns a list of metrics. An example metric might look like:
MetricName = CPUUtilization
Dimensions
(Name=InstanceId,
Value=i-5431413d)
Namespace = AWS/EC2