Tracking custom statistics in your Rails apps is super easy with StatHat. We have a gem that you need to add to your Gemfile:

gem 'stathat'

Then make calls to StatHat in your controllers or models. You do not need to create the stats first using the web interface.

StatHat::API.ez_post_value("load average", "steve@stathat.com", 0.92)
StatHat::API.ez_post_count("messages sent - female to male", "steve@stathat.com", 13)

The StatHat gem uses a pool of threads servicing a queue, so these calls will not block waiting for the requests to complete.

You can use ActiveSupport::Notifications to track some interesting internal stats in your Rails app. For example, to track SQL query duration, create a file in config/initializers named notifications.rb and put this code in it:

if Rails.env.production?
    ActiveSupport::Notifications.subscribe "sql.active_record" do |name, start, finish, id, payload|
        if payload[:name] == "SQL"
            duration = (finish - start) * 1000
            StatHat::API.ez_post_value("rails sql query duration", "steve@stathat.com", duration)

            if duration > 500
                StatHat::API.ez_post_count("rails slow sql query", "steve@stathat.com", 1)
            end
        end
    end
end

You can also track Rails request durations easily using a similar method:

ActiveSupport::Notifications.subscribe "process_action.action_controller" do |name, start, finish, id, payload|
    duration = (finish - start) * 1000
    unless payload[:view_runtime].nil?
        view_time = payload[:view_runtime]
        StatHat::API.ez_post_value("rails request view duration", "steve@stathat.com", view_time)
        if view_time > 100
            StatHat::API.ez_post_count("rails slow view duration", "steve@stathat.com", 1)
        end
    end
    unless payload[:db_runtime].nil?
        db_time = payload[:db_runtime]
        StatHat::API.ez_post_value("rails request db duration", "steve@stathat.com", db_time)
        if db_time > 100
            StatHat::API.ez_post_count("rails slow db duration", "steve@stathat.com", 1)
        end
    end
    if duration > 500
        StatHat::API.ez_post_count("rails slow request", "steve@stathat.com", 1)
    end
end

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