Amazon CloudWatch

CloudWatch is a monitoring service for your AWS resources. It is often used to monitor virtual machines, but it is not restricted to it and plays an important role even when your operation is based only on serverless functions. With CloudWatch, you can monitor errors, throttles, number of invocations, duration, and costs. You can also expand monitoring further with custom plugins.

This subject will be covered in Chapter 10, Testing, Deploying, and Monitoring.