Amazon EC2 Instance (Device Type)

The number of earned CPU credits that an instance has accrued since it was launched or started. For T2 Standard, the CPUCreditBalance also includes the number of launch credits that have been accrued.

Credits are accrued in the credit balance after they are earned, and removed from the credit balance when they are spent. The credit balance has a maximum limit, determined by the instance size. After the limit is reached, any new credits that are earned are discarded. For T2 Standard, launch credits do not count towards the limit.

The credits in the CPUCreditBalance are available for the instance to spend to burst beyond its baseline CPU utilization.

When an instance is running, credits in the CPUCreditBalance do not expire. When a T4g, T3a or T3 instance stops, the CPUCreditBalance value persists for seven days. Thereafter, all accrued credits are lost. When a T2 instance stops, the CPUCreditBalance value does not persist, and all accrued credits are lost.

CPU credit metrics are available at a five-minute frequency only.

Units: Credits (vCPU-minutes)

The percentage of allocated EC2 compute units that are currently in use on the instance. This metric identifies the processing power required to run an application on a selected instance.

Depending on the instance type, tools in your operating system can show a different percentage than CloudWatch when the instance is not allocated a full processor core.

Units: Percent

Bytes read from all instance store volumes available to the instance.

This metric is used to determine the volume of the data the application reads from the hard disk of the instance. This can be used to determine the speed of the application.

The number reported is the number of bytes received during the period. If you are using basic (5-minute) monitoring, you can divide this number by 300 to find Bytes/second. If you have detailed (1-minute) monitoring, divide it by 60.

If there are no instance store volumes, either the value is 0 or the metric is not reported.

Units: Bytes

Completed read operations from all instance store volumes available to the instance in a specified period of time.

To calculate the average I/O operations per second (IOPS) for the period, divide the total operations in the period by the number of seconds in that period.

If there are no instance store volumes, either the value is 0 or the metric is not reported.

Units: Count

Bytes written to all instance store volumes available to the instance.

This metric is used to determine the volume of the data the application writes onto the hard disk of the instance. This can be used to determine the speed of the application.

The number reported is the number of bytes received during the period. If you are using basic (5-minute) monitoring, you can divide this number by 300 to find Bytes/second. If you have detailed (1-minute) monitoring, divide it by 60.

If there are no instance store volumes, either the value is 0 or the metric is not reported.

Units: Bytes

Completed write operations to all instance store volumes available to the instance in a specified period of time.

To calculate the average I/O operations per second (IOPS) for the period, divide the total operations in the period by the number of seconds in that period.

If there are no instance store volumes, either the value is 0 or the metric is not reported.

Units: Count

The number reported is the number of bytes received during the period. If you are using basic (5-minute) monitoring and the statistic is Sum, you can divide this number by 300 to find Bytes/second. If you have detailed (1-minute) monitoring and the statistic is Sum, divide it by 60.

Units: Bytes

The number of packets received by the instance on all network interfaces. This metric identifies the volume of incoming traffic in terms of the number of packets on a single instance.

This metric is available for basic monitoring only (5-minute periods). To calculate the number of packets per second (PPS) your instance received for the 5 minutes, divide the Sum statistic value by 300.

Units: Count

The number of packets sent out by the instance on all network interfaces. This metric identifies the volume of outgoing traffic in terms of the number of packets on a single instance.

This metric is available for basic monitoring only (5-minute periods). To calculate the number of packets per second (PPS) your instance sent for the 5 minutes, divide the Sum statistic value by 300.

Units: Count

The number of bytes sent out by the instance on all network interfaces. This metric identifies the volume of outgoing network traffic from a single instance.

The number reported is the number of bytes sent during the period. If you are using basic (5-minute) monitoring and the statistic is Sum, you can divide this number by 300 to find Bytes/second. If you have detailed (1-minute) monitoring and the statistic is Sum, divide it by 60.

Units: Bytes