Amazon CloudWatch Alarms

What gets missed

The unit is the alarm metric, so a metric-math alarm referencing ten metrics costs ten times a plain one. Composite alarms bill per alarm. Sitting in INSUFFICIENT_DATA changes nothing.

Find it on your bill

Filter Cost Explorer or your Cost and Usage Report by these usage types. A usage type with no region prefix means us-east-1.

• CW:AlarmMonitorUsage
• CW:HighResAlarmMonitorUsage
• CW:CompositeAlarmMonitorUsage

Bills the same way

These services turn exactly the same meters, so what you learn here transfers.

• Amazon ECS
• Amazon EKS
• Amazon EKS Anywhere
• Amazon EMR
• Amazon Managed Grafana
• Amazon RDS Proxy