Hetul Sheth outlines how to set up CloudWatch Agent for disk and memory monitoring and use custom metrics to avoid false alarms in scenarios where instance size might change due to intentional or unintentional actions.

They provide detailed guidance on setting up automation and event trigger to update the CloudWatch Agent configuration file, detect the instance size change, and reconfigure metrics while keeping alarms functional. A lambda function is used to trigger SSM to run the desired parameter.