This article describes the process of creating a Slack notification from a CloudWatch alarm generated from an undesirable state in an SQS (Simple Queue Service) queue, via SNS (Simple Notification Service) and Lambda.
You can of course modify any of these to suit your differing requirements. For example, the source could be a different SQS state, or the source could be some other AWS service rather than SQS, or you may want to send the notification to somewhere other than Slack (in which case a different Lambda function may be required), etc.
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