I believe what you configured is an EventBridge rule, not a CloudWatch alarm.
And the rules you set will react when "CreateManagedPrefixList", "ModifyManagedPrefixList", and "DeleteManagedPrefixList" occur in CloudTrail.
I tried it in my environment and was able to confirm that emails were sent via SNS.
I think it will take some time for the monitoring of EventBridge rules to be reflected.
Try actually creating or deleting a prefix list and recording the API history in CloudTrail.
- asked 2 months ago
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