You can now record configuration changes to AWS Lambda using AWS Config. AWS Lambda lets you run code without provisioning or managing servers. With Config, you can track changes to the Lambda function, runtime environments, tags, handler name, code size, memory allocation, timeout settings, and concurrency settings. You can also record changes to Lambda IAM execution role, subnet, and security group associations. In addition, you can now use a managed Config rule to check whether your Lambda functions prohibit public access.

Source: Amazon Web Services News AWS Config Adds Support for AWS Lambda