policyType

[Custom policies only] The valid target resource types and actions a policy can manage. Specify EBS_SNAPSHOT_MANAGEMENT to create a lifecycle policy that manages the lifecycle of Amazon EBS snapshots. Specify IMAGE_MANAGEMENT to create a lifecycle policy that manages the lifecycle of EBS-backed AMIs. Specify EVENT_BASED_POLICY to create an event-based policy that performs specific actions when a defined event occurs in your Amazon Web Services account.

The default is EBS_SNAPSHOT_MANAGEMENT.