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What is this?

This is a Ruby version of performance metrics inspired by metrics developed by Coda Hale at Yammer. Currently this is under heavy development -- it needs Gem packaging, more features, validation of metrics, more functional testing, and a little better test coverage. Pull requests happily accepted, please include docs and tests where possible!

What needs to be done?

Among other important things, this needs to be made more thread-safe. I'm currently looking at Mr. Nutter's ruby-atomic gem for making this less tedious but any suggestions are welcome!

What's in this?

Right now, I have:

  • Counters
  • Meters
  • Gauges
  • Histograms w/ uniform sampling
  • Histograms w/ exponentially decaying sampling


  • Timers

Getting Started

The goal of ruby-metrics is to get up and running quickly. You start an agent, register some instruments, and they're exported over HTTP via JSON. For example, getting started with a counter would look like this:

@metrics =

counter = @metrics.counter :my_counter

Then, hitting localhost:8001/status would yield:



Copyright 2011 John Ewart Released under the MIT license. See the file LICENSE for further details.

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