These are Users that can log into your Serverless Console Organization.

A Trace is telemetry from a single AWS Lambda invocation. Each Trace includes Logs. These are bundled together into this single unit. If you send only Logs to us, a minimal Trace will still be created to help you search across those Logs.

This is how we charge for AWS Lambda Metrics. However, we don't want to charge for inactive AWS Lambda functions, which are common in development environments. Therefore, this price is only tracked if an AWS Lambda function receives an invocation within a 24 hour period.