AWS Lambda Monitor is a small monitoring tool which runs in AWS Lambda. The tool is triggered either regularly by a CloudWatch scheduled task or on demand by an email triggered event. With this tool you can monitor services on servers out on the internet for free and receive alert emails when there are problems. The rationale behind creating this tool (instead of using one of the many existing monitoring tools in existence) is to take advantage of the AWS Lambda pricing model to get free monitoring forever. AWS provides 37 days of 128MB memory Lambda execution per month. Unlike the EC2 free tier, the Lambda free tier doesn't expire after the first year.