The amount of swap space used.
This metric is available for the Aurora PostgreSQL DB instance classes db.t3.medium, db.t3.large, db.r4.large, db.r4.xlarge, db.r5.large, db.r5.xlarge, db.r6g.large, and db.r6g.xlarge.
For Aurora MySQL, this metric applies only to db.t* DB instance classes.
This metric is not available for SQL Server.