Their tagline: AWS Lambda monitoring, alerting and debugging made easy. 2-min setup, no code changes!
Automated monitoring & troubleshooting for serverless applications, using tracing and logging. Free tier available.
IOpipe is a tool and service that helps you instrument and monitor your functions in dev and production. Free tier available for smaller projects.
The Serverless Framework provides powerful application metrics, with zero configuration required. It includes stacktraces, real-time alerts, notifications and more. Free tier available.