Servers.lol is a tool we built to help us figure out if our EC2 based workloads were a good candidate for migrating towards serverless on AWS Lambda. There's an automated tool if you're using Elastic Beanstalk, otherwise answer a few questions and you'll get a cost comparison and recommendation.
IOpipe is an application operations platform built for serverless architectures running on AWS Lambda. Through the collection of high fidelity telemetry within Lambda invocations, users can quickly correlate important data points to discover anomalies and identify issues. IOpipe offers tracing, profiling, metrics, monitoring, and more.