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Create an EC2 - Instance....
How to enable monitoring for already created EC2 instances
- Open the Amazon EC2 console at https://console.aws.amazon.com/ec2/.
- In the navigation pane, choose Instances.
2. Select the instance and choose Actions, Monitoring, Manage detailed monitoring.
3. On the Detailed monitoring detail page, for Detailed monitoring, select the Enable check box and choose Save.
aws ec2 monitor-instances --intance-ids <xxxxxxxxxxx>
Related post - How to create a monitoring alert for EC2 instances (AWS)