Alarms on CloudWatch Metrics Insights queries in CloudWatch

You can create alarms on Metrics Insights queries. This helps you have alarms that track multiple resources without needing to be updated later. The query catches new resources and resources that change. For example, you can create an alarm that watches the CPU utilization of your fleet, and the alarm automatically evaluates new instances that you launch after creating the alarm.

In a monitoring account that is set up for CloudWatch cross-account observability, your Metrics Insights alarms can watch resources in source accounts and in the monitoring account itself. For more information about how to limit your alarm queries to a specific account or to group the results by account ID, see the WHERE and GROUP BY sections in Query components and syntax in CloudWatch Metrics Insights.

Using tags in alarm queries

You can create alarms on Metrics Insights queries that use Amazon resource tags to filter and group metrics. To use tags with alarms, on the https://console.amazonaws.cn/connect/, choose Settings. On the CloudWatch Settings page, under Enable resource tags on telemetry, choose Enable. Context-aware alarms monitor specific applications, environments, or teams automatically as resources change.

For example, you can create an alarm that monitors CPU utilization for all Amazon EC2 instances tagged with a specific application.

SELECT MAX(CPUUtilization) FROM "AWS/EC2" WHERE tag.Application = 'Orders' AND tag.Environment = 'Prod'

Tag-based alarms automatically adapt as you add or remove resources with matching tags, providing dynamic monitoring aligned with your operational structure.