Amazon CloudWatch Alarms Can Now Directly Trigger Lambda Functions
Briefly

Designed to be the easiest way to automate custom actions on alarm state changes, the new option allows developers to invoke a Lambda function directly when a CloudWatch alarm changes to an OK, ALARM, or INSUFFICIENT_DATA state.
According to the documentation, when a Lambda function is configured as an alarm action, CloudWatch delivers a JSON payload to the Lambda function when it invokes it, including alarmData, previousState, and configuration information.
Read at InfoQ
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