AWS Lambda enables engineering teams to build modern and scalable services without provisioning underlying infrastructure resources. Monitoring Lambda functions requires visibility into performance indicators that differ from traditional architectures, particularly cold starts which occur when a serverless compute platform like Lambda needs to create a new execution environment to serve a request. Datadog Serverless Monitoring detects cold starts in Lambda functions, visualizes their impact on services via distributed tracing, and lets users set alerts based on the rates at which cold starts occur. The partnership between AWS and Datadog enables support for AWS Lambda SnapStart, a feature that improves startup performance for latency-sensitive Java applications by up to 10 times without modification or extra cost. Teams can use Datadog Serverless Monitoring to detect cold starts, reduce cold start latency with Lamba SnapStart, and gain complete visibility into the impact of cold starts on Lambda functions.