The Amazon CloudWatch provides standard metrics for serverless applications on AWS Lambda, but custom metrics can provide additional visibility into unique business use cases and application performance. The Datadog Lambda extension enables developers to collect and forward custom metrics, traces, and logs directly to Datadog, allowing for enhanced monitoring and troubleshooting capabilities. With the extension, users can instrument their functions to send custom metrics, generate metrics from logs and traces, and rapidly identify and troubleshoot business-impacting issues. By leveraging custom metrics, developers can create useful dashboards, monitors, and SLOs to visualize and alert on data specific to their business, ultimately gaining full visibility into their serverless applications and infrastructure.