NGINX is a fast, stable, and reliable open source web server that has been widely adopted as a content cache and media streaming server, and also serves as a reverse proxy to other services. It's available in both open source and commercial models and can handle requests asynchronously with a small memory footprint. Monitoring NGINX is critical to ensure the health of your web application and server environment, and it can be done using tools like New Relic, which provides key performance metrics such as net.connectionsAcceptedPerSecond, net.connectionsActive, and net.requestsPerSecond. The integration uses the New Relic Infrastructure agent to collect and send performance metrics from NGINX servers to the New Relic platform, providing useful aggregates of client connection counts and detailed error reports for HTTP error responses. By setting up the NGINX integration, you can get early warnings on critical metrics and prevent failures that might result in a poor user experience in your web applications.