Open Tracing instrumentation for rack. By default it starts a new span for every request and follows the open tracing tagging semantic conventions. This is inspired by the rack-tracer gem, and sections of the code here are taken from there.


Add this line to your application's Gemfile:

gem "rack-instrumentation"

And then execute:

$ bundle

Or install it yourself as:

$ gem install rack-instrumentation


Require the gem (Note: this won't automatically instrument rack)

require "rack/instrumentation"

If you have set up OpenTracing.global_tracer you can turn on spans for all requests in your config.ru thusly:

use Rack::OpenTracing::Tracer

Similarly, this works for rails applications:

Rails.application.configure do
  config.middleware.use Rack::Instrumentation::Tracer


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.


Bug reports and pull requests are welcome on GitHub at https://github.com/[USERNAME]/rack-instrumentation-ruby.


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