System Metrics is a new Rails 3 Engine providing a clean web interface to the performance metrics instrumented with ActiveSupport::Notifications. It will collect and display the notifications baked into Rails and any additional custom ones you add using ActiveSupport::Notification#instrument.

System Metrics is not intended to be a replacement for performance monitoring solutions such as New Relic. However, it is especially handy for quickly identifying performance problems in a development environment. It's also a great alternative for private networks disconnected from the Internet.

You can find more information about System Metrics on the System Metrics site. Please kick the tires and let us know what you think.

System Metrics Detail View