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An Amazon Machine Image (AMI) contains all information necessary to boot instances of your software. For example, an AMI might contain all the software to act as a web server (e.g., Linux, Apache, and your web site) or it might contain all the software to act as a Hadoop node (e.g., Linux, Hadoop, and a custom application). After an AMI is launched, the resulting running system is called an instance. All instances based on the same AMI start out identical and any information on them is lost when the instances are terminated or fail. Users with valid AWS user accounts can sign into the EC2 cloud to view and use available instances, or purchase and launch new ones. With the help of this test, you can determine the total number of instances that are currently available for the configured AWS user account, the number of instances that were newly purchased/terminated, and the count of powered-off instances.

Measurement	Description	Measurement Unit	Interpretation
Total_instances	Indicates the total number of instances currently available for the configured AWS user account.	Number	The detailed diagnosis capability of this measure, if enabled, shows the details of all the instances available for use for the configured AWS account, regardless of the current state of the instances.
Instance_powered_on	Indicates the total number of instances that are currently powered-on.	Number	The detailed diagnosis capability of this measure, if enabled, shows the details of all the powered-on instances available for use for the configured AWS account.
Instance_powered_off	Indicates the total number of instances that are currently powered-off.	Number	The detailed diagnosis capability of this measure, if enabled, shows the details of all the powered-off instances available for the configured AWS account.
Added_instances	Indicates the total number of instances that were newly purchased by the configured AWS user account during the last measurement period.	Number	The detailed diagnosis capability of this measure, if enabled, shows the details of all the instances that were newly purchased and launched by the configured AWS user account.
Removed_instances	Indicates the total number of instances that were newly terminated by the configured AWS user account during the last measurement period.	Number	The detailed diagnosis capability of this measure, if enabled, shows the details of all the instances that were newly terminated/removed by the configured AWS user account.