Engineer Builds Zero-Cost AWS Tool to Detect Forgotten Suspended Auto Scaling Groups

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A software engineer developed a serverless monitoring system to detect suspended Amazon EC2 Auto Scaling Groups (ASGs) that are often forgotten after incidents. The tool uses AWS Lambda, EventBridge, and SES to scan all ASGs daily and email an HTML report listing any groups with suspended processes such as Launch, HealthCheck, or Terminate. Suspended ASGs pose a silent risk because AWS does not trigger any default alarms, meaning failures may only surface during the very incident where scaling was needed. The solution is entirely dependency-free, requires no dedicated servers or agents, and costs virtually nothing to operate. The engineer also documented two real production bugs encountered during development, offering practical lessons for others building similar serverless workflows.

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