How to monitor Lambda functions

AWS Lambda is a popular service for running code on demand without managing underlying compute instances. Monitoring serverless applications like those in AWS Lambda presents unique challenges compared to traditional application monitoring, as there's no long-lived host to monitor and collect telemetry data. However, proper instrumentation of applications and supporting services can ensure observability even in the absence of metrics on CPU, memory, etc. Datadog provides a serverless monitoring solution for AWS Lambda that includes custom metrics from Lambda functions, integration with other AWS services, and alerting features.