New Relic's Flex is a customizable solution that allows users to collect and send custom data from various applications and tools, including environmental solutions for temperature and HVAC, local backup tools, cable and network management systems, and more. It works by using the New Relic infrastructure agent and a config file to generate the desired data format. Flex can be used to monitor services running in Kubernetes, IoT devices, and other non-traditional hardware, as well as combine data from closed applications with server performance data. The solution requires basic knowledge of New Relic Query Language (NRQL) and YAML configuration files, but users can get started quickly with a sample and documentation. Flex is available for free with a New Relic account, which includes 100 GB/month of free data ingest, one free full-access user, and unlimited free basic users.