Rails Autoscale Agent

This gem works together with the Rails Autoscale Heroku add-on to automatically scale your web dynos as needed. It gathers a minimal set of metrics for each request, and periodically posts this data asynchronously to the Rails Autoscale service.

Requirements

We've tested this with Rails versions 3.2 through 5.0 and Ruby versions 1.9.3 through 2.3.1.

Getting Started

Add this line to your application's Gemfile and run bundle:

gem 'rails_autoscale_agent'

This will automatically insert the agent into your Rack middleware stack.

The agent will only communicate with Rails Autoscale if a RAILS_AUTOSCALE_URL ENV variable is present, which happens automatically when you install the Heroku add-on. In development (or anytime the ENV var is missing), the middleware will still produce INFO-level log output to your Rails log.

Development

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 rubygems.org.

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/adamlogic/rails_autoscale_agent.

License

The gem is available as open source under the terms of the MIT License.