CloudWatch metrics for DB instances

Amazon CloudWatch also contains metrics that Amazon RDS publishes automatically. The metrics that reside in the AWS/RDS namespace are instance-level metrics, which refers to the Amazon RDS (service) instance (that is, the isolated database environment running in the cloud) rather than the DB instance in the strict sense of the mysqld process. Therefore, most of those default metrics fall under the category of OS metrics, in the strict definition of the term. Examples include: CPUUtilization, WriteIOPS, SwapUsage, and others. Nevertheless, there are some DB instance metrics that are applicable to MariaDB and MySQL:

• BinLogDiskUsage – The amount of disk space occupied by binary logs.

• DatabaseConnections – The number of client network connections to the DB instance.

• ReplicaLag – The amount of time a read replica DB instance lags behind the source DB instance.