Claims to be an easy-to-integrate self-hosted tool to monitor the performance of your Ruby on Rails application. This is a simple and free alternative to the New Relic APM, Datadog or other similar services. Realtime monitoring, throughput, average response time, which bits are the slowest, database queries, delayed_job monitoring, and custom events.

Known to work with Rails v4.2 and later. Requires Redis to hold the stats.

Amazingly, plugs right into Huginn using the default instructions.