The text discusses New Relic Flex, an application-agnostic tool that allows users to collect metric data from a wide variety of services without requiring dedicated integrations. It provides a curated approach for popular services and applications, but also offers a more flexible option for custom applications through the use of Flex functions, which can perform various tasks on the collected data, such as math operations, filtering, and regular expression extraction. The tool is designed to be easy to use and configure, with example configurations provided for integrating it with popular services like LibreNMS and Linux command-line utilities. With Flex, users can instrument any application that exposes metric data in some way, making it a powerful tool for monitoring and analyzing software applications.