Built-in metrics for out-of-the box Rails applications monitoring.

If your monitoring system already collects Rails metrics (e.g. NewRelic) then most probably you don't need this gem.

Sample Grafana dashboard ID: 11668

Installation

Add this line to your application's Gemfile:

gem 'yabeda-rails'
# Then add monitoring system adapter, e.g.:
# gem 'yabeda-prometheus'

And then execute:

$ bundle

Registering metrics on server process start

Currently, yabeda-rails automatically registers rails metrics when a server is started via rails server, puma -C config/puma.rb or unicorn -c. However, other application servers or launching via rackup aren't supported at the moment.

A possible workaround is to detect server process and manually activate yabeda-rails in an initializer:

# config/initializers/yabeda.rb

if your_app_server_process? # Your logic here
  Yabeda::Rails.install!
end

You always can add support for your app server to lib/yabeda/rails/railtie.rb. Pull Requests are always welcome!

Metrics

• Total web requests received: rails_requests_total
• Web request duration: rails_request_duration (in seconds)
• Views rendering duration: rails_view_runtime (in seconds)
• DB request duration: rails_db_runtime (in seconds)

Hooks

• on_controller_action: Allows to collect

  Yabeda::Rails.on_controller_action do |event, labels|
    next unless event.payload[:ext_service_runtime]
    time_in_seconds = event.payload[:ext_service_runtime] / 1000.0
    rails_ext_service_runtime.measure(labels, time_in_seconds)
  end

Custom tags

You can add additional tags to the existing metrics by adding custom payload to your controller.

# This block is optional but some adapters (like Prometheus) requires that all tags should be declared in advance
Yabeda.configure do
  default_tag :importance, nil
end

class ApplicationController < ActionController::Base
  def append_info_to_payload(payload)
    super
    payload[:importance] = extract_importance(params)
  end
end

append_info_to_payload is a method from ActionController::Instrumentation

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.

Releasing

1. Bump version number in lib/yabeda/rails/version.rb

   In case of pre-releases keep in mind rubygems/rubygems#3086 and check version with command like Gem::Version.new(Yabeda::Rails::VERSION).to_s

2. Fill CHANGELOG.md with missing changes, add header with version and date.

3. Make a commit:

   git add lib/yabeda/rails/version.rb CHANGELOG.md
   version=$(ruby -r ./lib/yabeda/rails/version.rb -e "puts Gem::Version.new(Yabeda::Rails::VERSION)")
   git commit --message="${version}: " --edit

4. Create annotated tag:

   git tag v${version} --annotate --message="${version}: " --edit --sign

5. Fill version name into subject line and (optionally) some description (list of changes will be taken from changelog and appended automatically)

6. Push it:

   git push --follow-tags

7. You're done!

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/yabeda-rb/yabeda-rails.

License

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