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This is a Puma plugin for NewRelic custom metrics. It will sample the Puma stats and create a custom metric for NewRelic. You can view the information in the NewRelic insights or in NewRelic One.


Add this line to your application's Gemfile:

gem 'puma-newrelic'

And then execute:

$ bundle install

Or install it yourself as:

$ gem install puma-newrelic


  • Install the gem
  • Add plugin 'new_relic_stats' to your puma.rb
  • Create a dashboard on the NewRelic insights or NewRelic One

NQRL example:

SELECT rate(average(newrelic.timeslice.value), 1 minute) 
FROM Metric 
WHERE appName ='My App Name' 
WITH METRIC_FORMAT 'Custom/Puma/pool_capacity' 
TIMESERIES FACET `host` LIMIT 10 SINCE 1800 seconds ago


After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to


Bug reports and pull requests are welcome on GitHub at[USERNAME]/puma-newrelic. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the code of conduct.

Code of Conduct

Everyone interacting in the Puma::Newrelic project's codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.


Puma stats sampler for New Relic


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