You can set alarm rules by referring to Setting Alarm Rules to customize the monitored objects and notification policies and keep track of the RDS running status.
The RDS alarm rules include alarm rule names, resource types, dimensions, monitored objects, metrics, alarm thresholds, monitoring period, and whether to send notifications.

Log in to the management console.
Click Service List and choose Management & Governance > Cloud Eye.
In the navigation pane on the left, choose Alarm Management > Alarm Rules.
On the displayed Alarm Rules page, click Create Alarm Rule.
For details about how to create alarm rules, see Using Alarm Templates to Create an Alarm Rule in the Cloud Eye User Guide.