Create EventBridge rules
When an event is emitted by Amazon EC2 Auto Scaling, an event notification is sent to Amazon EventBridge as a JSON file. You can write an EventBridge rule to automate what actions to take when an event pattern matches the rule. If EventBridge detects an event pattern that matches a pattern defined in a rule, EventBridge invokes the target (or targets) specified in the rule.
You can use the example procedures in this section as a starting point.
You may also find the following documentation useful.
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To perform custom actions on instances as they are launching or before they are terminated using a Lambda function, see Tutorial: Configure a lifecycle hook that invokes a Lambda function.
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To invoke a Lambda function on API calls logged with CloudTrail, see Tutorial: Log Amazon API calls using EventBridge in the Amazon EventBridge User Guide.
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For more information about how to create event rules, see Creating Amazon EventBridge rules that react to events in the Amazon EventBridge User Guide.