monitoring
The ARN for the IAM role that permits RDS to send enhanced monitoring metrics to Amazon CloudWatch Logs. For example, `arn:aws:iam:123456789012:role/emaccess`. For information on creating a monitoring role, see Setting Up and Enabling Enhanced Monitoring in the Amazon RDS User Guide. If `MonitoringInterval` is set to a value other than `0`, then you must supply a `MonitoringRoleArn` value. This setting doesn't apply to RDS Custom DB instances.