Gunicorn is an open-source WSGI HTTP server developed in 2010 by Benoit Chesneau, commonly used to run Python applications, and can be easily configured, lightweight, and scalable. It's often implemented with a reverse proxy server like NGINX, which handles requests for static resources and passes on the dynamic portion of the request to Gunicorn. Datadog provides an out-of-the-box Gunicorn dashboard that shows information such as resource utilization, work metrics, and request duration, allowing users to monitor Gunicorn's performance alongside other elements of their infrastructure. The integration collects metrics including latency, throughput, HTTP status codes, and resource utilization, enabling users to investigate issues as they arise, set up targeted alerts, and start monitoring Gunicorn.