If you are using the shared version of KMS (KMS 1.0), we recommend migrating your resources to a KMS 3.0 instance (software or hardware key management) in the same region for higher service quality and stability.
Considerations
KMS 1.0 and 3.0 differ in various aspects, such as features and billing methods. Before migrating, it's important to assess the differences between KMS 1.0 and 3.0. This includes understanding the benefits, migration limitations, costs, and instance selection options for KMS 3.0. Based on this assessment, you can decide whether to proceed with the migration.