Yabeda plugin to collect essential metrics for database query performance and connection pool stats.

Installation

Install the gem and add to the application's Gemfile by executing:

$ bundle add yabeda-activerecord

Launch/restart your application and that's it: metrics are being collected.

To expose metrics Don't forget to also add one of Yabeda adapters to your Gemfile.

Metrics

Query performance

Metric	Type	Tags	Description
queries_total	counter	config, kind, cached, async	Total number of SQL queries issued by application via ActiveRecord
query_duration	histogram	config, kind, cached, async	Duration for SQL queries generated by ActiveRecord

Connection pool stats

Metric	Type	Tags	Description
connection_pool_size	gauge	config	Connection pool size
connection_pool_connections	gauge	config	Total number of connections currently created in the pool (sum of busy, dead, and idle).
connection_pool_busy	gauge	config	Number of connections that has been checked out by some thread and are in use now.
connection_pool_dead	gauge	config	Number of lost connections for the pool. A lost connection can occur if a programmer forgets to checkin a connection at the end of a thread or a thread dies unexpectedly.
connection_pool_idle	gauge	config	Number of free connections, that are available for checkout.
connection_pool_waiting	gauge	config	Number of threads waiting for a connection to become available for checkout.
connection_pool_checkout_timeout	gauge	config	Checkout waiting timeout in seconds

Tags

• config — database configuration name in the database.yml
• kind — query kind, usually referring to action over model. E.g. Post Load
• cached — true if query wasn't executed against the database, results was retrieved from in-memory cache.
• async — true if query was loaded in background via load_async

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.

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

Releasing

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

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

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

3. Make a commit:

   git add lib/yabeda/active_record/version.rb CHANGELOG.md
   version=$(ruby -r ./lib/yabeda/active_record/version.rb -e "puts Gem::Version.new(Yabeda::ActiveRecord::VERSION)")
   git commit --message="${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. GitHub Actions will create a new release, build and push gem into RubyGems! You're done!

Contributing

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

License

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