Describes the credit option for CPU usage of the specified burstable performance
instances. The credit options are
If you do not specify an instance ID, Amazon EC2 returns burstable performance
instances with the
unlimited credit option, as well as instances that were
previously configured as T2, T3, and T3a with the
unlimited credit option.
For example, if you resize a T2 instance, while it is configured as
unlimited, to an M4 instance, Amazon EC2 returns the M4
If you specify one or more instance IDs, Amazon EC2 returns the credit option
unlimited) of those instances. If you specify
an instance ID that is not valid, such as an instance that is not a burstable
performance instance, an error is returned.
Recently terminated instances might appear in the returned results. This interval is usually less than one hour.
If an Availability Zone is experiencing a service disruption and you specify instance IDs in the affected zone, or do not specify any instance IDs at all, the call fails. If you specify only instance IDs in an unaffected zone, the call works normally.
For more information, see Burstable performance instances in the Amazon EC2 User Guide.