If you are using the Alibaba Cloud shared version of KMS (also called KMS 1.0), for higher service quality and stability, we recommend that you migrate resources to a same-region KMS software or hardware key management instance (also called KMS 3.0).
Considerations
KMS 1.0 and 3.0 differ in various aspects, such as features and billing methods. Before migration, we recommend that you perform the assessment, and learn about some migration considerations, such as the benefits, resource migration limitations and cost of KMS 3.0, and the selection guide of KMS 3.0 instances. Then you can decide if the migration is needed or contact technical support, and migrate resources based on your business requirements.