ApsaraDB RDS for SQL Server - The kill permission is openly available to SQL Server 2008 R2 users.
Jan 08 2018ApsaraDB RDS for SQL Server
Feature released: Users created in the console earlier than SQL Server 2008 R2 do not have the kill permission. After the release of this feature, new users created in the database instance by the customer have the kill permission, and the customer can grant the permission to existing users through these new users. Target customers: users of RDS for SQL Server 2008 R2.