Extendable solution for easy setup of monitoring in your Ruby apps.

Read more about Yabeda and the reasoning behind it in Martian Chronicles: “Meet Yabeda: Modular framework for instrumenting Ruby applications”

Installation

Most of the time you don't need to add this gem to your Gemfile directly (unless you're only collecting your custom metrics):

gem 'yabeda'

# Add some plugins to quickly start collecting some essential metrics:
# gem 'yabeda-rails'
# gem 'yabeda-sidekiq'

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

And then execute:

$ bundle

Usage

1. Declare your metrics:

   Yabeda.configure do
     group :your_app do
       counter   :bells_rang_count, comment: "Total number of bells being rang", tags: %i[bell_size]
       gauge     :whistles_active,  comment: "Number of whistles ready to whistle"
       histogram :whistle_runtime do
         comment "How long whistles are being active"
         unit :seconds
       end
       summary :bells_ringing_duration, unit: :seconds, comment: "How long bells are ringing"
     end
   end

2. After your application was initialized and all metrics was declared, you need to apply Yabeda configuration:

   Yabeda.configure!

   If you're using Ruby on Rails then it will be configured automatically!

3. Access metric in your app and use it!

   def ring_the_bell(id)
     bell = Bell.find(id)
     bell.ring!
     Yabeda.your_app.bells_rang_count.increment({bell_size: bell.size}, by: 1)
   end
   
   def whistle!
     Yabeda.your_app.whistle_runtime.measure do
       # Run your code
     end
   end

4. Setup collecting of metrics that do not tied to specific events in you application. E.g.: reporting your app's current state

   Yabeda.configure do
     # This block will be executed periodically few times in a minute
     # (by timer or external request depending on adapter you're using)
     # Keep it fast and simple!
     collect do
       your_app.whistles_active.set({}, Whistle.where(state: :active).count)
     end
   end

5. Optionally setup default tags for all appropriate metrics

   Yabeda.configure do
     # matches all metrics in all groups
     default_tag :rails_environment, 'production'
   
     # matches all metrics in the :your_app group
     default_tag :tag_name, 'override', group: :your_app
   end
   
   # You can redefine them for limited amount of time
   Yabeda.with_tags(rails_environment: 'staging') do
     Yabeda.your_app.bells_rang_count.increment({bell_size: bell.size}, by: 1)
   end

   Note: any usage of with_tags must have all those tags defined on all metrics that are generated in the block.

6. Optionally override default tags using precedence:

   The tag precedence from high to low is:

   • Manually specified tags
   • Thread local tags (specified by Yabeda.with_tags)
   • Group specific tags
   • Global tags

7. See the docs for the adapter you're using

8. Enjoy!

Available monitoring system adapters

Maintained by Yabeda

• Prometheus:
  • yabeda-prometheus — wraps official Ruby client for Prometheus.
  • yabeda-prometheus-mmap — wraps GitLab's fork of Prometheus Ruby client which may work better for multi-process application servers.
• Datadog
• NewRelic

Third-party adapters

These are developed and maintained by other awesome folks:

• Statsd
• AWS CloudWatch
• Honeybadger Insights
• …and more! You can write your own adapter and open a pull request to add it into this list.

Available plugins to collect metrics

Maintained by Yabeda

• yabeda-rails — basic request metrics for Ruby on Rails applications.
• yabeda-activerecord — query performance and connection pool stats for apps using ActiveRecord to query databases.
• yabeda-sidekiq — comprehensive set of metrics for monitoring Sidekiq jobs execution and queues.
• yabeda-faktory — metrics for monitoring jobs execution by Ruby workers of Faktory.
• yabeda-graphql — metrics to query and field-level monitoring for apps using GraphQL-Ruby.
• yabeda-puma-plugin — metrics for internal state and performance of Puma application server.
• yabeda-http_requests — monitor how many outgoing HTTP calls your application does (uses Sniffer).
• yabeda-schked — monitor number and duration of Cron jobs executed by Schked.
• yabeda-anycable — monitor number, duration, and status of AnyCable RPC calls.

Third-party plugins

These are developed and maintained by other awesome folks:

• yabeda-grape — metrics for Grape framework.
• yabeda-gruf — metrics for gRPC Ruby Framework
• yabeda-gc — metrics for Ruby garbage collection.
• yabeda-activejob — backend-agnostic metrics for background jobs.
• yabeda-shoryuken — metrics for Shoryuken jobs execution message queues.
• yabeda-rack-ratelimit — metrics for Rack::Ratelimit
• …and more! You can write your own adapter and open a pull request to add it into this list.

Configuration

Configuration is handled by anyway_config gem. With it you can load settings from environment variables (which names are constructed from config key upcased and prefixed with YABEDA_), YAML files, and other sources. See anyway_config docs for details.

Config key	Type	Default	Description
debug	boolean	false	Collects metrics measuring Yabeda performance

Debugging metrics

• Time of collector block run: yabeda_collect_duration (segmented by block source location). Collector blocks are used for collecting metrics of application state and usually makes some potentially slow queries to databases, network requests, etc.

These are only enabled in debug mode. To enable it either set debug config key to true (e.g. by specifying YABEDA_DEBUG=true in your environment variables or executing Yabeda.debug! in your code).

Testing

RSpec

Add the following to your rails_helper.rb (or spec_helper.rb):

require "yabeda/rspec"

Now you can use increment_yabeda_counter, update_yabeda_gauge, measure_yabeda_histogram, and observe_yabeda_summary matchers:

it "increments counters" do
  expect { subject }.to increment_yabeda_counter(Yabeda.myapp.foo_count).by(3)
end

You can scope metrics by used tags with with_tags:

it "updates gauges" do
  expect { subject }.to \
    update_yabeda_gauge("some_gauge_name").
    with_tags(method: "command", command: "subscribe")
end

Note that tags you specified doesn't need to be exact, but can be a subset of tags used on metric update. In this example updates with following sets of tags { method: "command", command: "subscribe", status: "SUCCESS" } and { method: "command", command: "subscribe", status: "FAILURE" } will make test example to pass.

And check for values with by for counters, to for gauges, and with for histograms and summaries (and you can use other matchers here):

expect { subject }.to \
  measure_yabeda_histogram(Yabeda.something.anything_runtime).
  with(be_between(0.005, 0.05))

You also can specify multiple tags and their expected values in with:

expect { whatever }.to increment_yabeda_counter(:my_counter).with(
  { tag: "foo" } => 1,
  { tag: "bar" } => (be >= 42),
)

Roadmap (aka TODO or Help wanted)

• Ability to change metric settings for individual adapters

  histogram :foo, comment: "say what?" do
    adapter :prometheus do
      buckets [0.01, 0.5, …, 60, 300, 3600]
    end
  end

• Ability to route some metrics only for given adapter:

  adapter :prometheus do
    include_group :sidekiq
  end

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/version.rb

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

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

3. Make a commit:

   git add lib/yabeda/version.rb CHANGELOG.md
   version=$(ruby -r ./lib/yabeda/version.rb -e "puts Gem::Version.new(Yabeda::VERSION)")
   git commit --message="${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 (changes will be taken from changelog and appended automatically)

6. Push it:

   git push --follow-tags

Contributing

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

License

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