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Latest commit 04c55fe Jul 12, 2018



Add this line to your application's Gemfile:

gem 'rack-tracer'


require 'opentracing'
OpenTracing.global_tracer =

require 'rack/tracer'
use Rack::Tracer

You can access the created span using


or you can use


See opentracing-ruby for more information how active_span works and what are its limitations.

You can also add start and finish span callbacks

use Rack::Tracer,
    on_start_span: ->(span) { do_something(span) },
    on_finish_span: ->(_span) { do_something(span) }


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


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