Ruby on Rails - measure frequency of actions (for optimalization or improving user interface)

action.rb

# 3. wait few days (weeks) to gather data :)
# 4. display results by this rake task sorted from most frequent action to least frequent action
# rake action:show_frequency
# 5. The rule 80/20 says - users are doing 20% of actions in 80% of time
# -> increase performance, improve user experience, ...  of these actions 
namespace :action do
  desc "This tasks shows freuquency of requests"
  task show_frequency: :environment do
    sum = Action.sum(:count)
    Action.all.order('count desc').each_with_index do |a, index|
      p "#{index}, #{a.controller}##{a.action_name}, " + ((a.count.to_f / sum.to_f) * 100).round(2).to_s +  ", " + a.count.to_s
    end
  end
end

application_controller.rb

# 1. I am saving results to database
# rails generate  model Action controller:string action_name:string count:integer

# 2. add after_filter to increase count of executed action
class ApplicationController < ActionController::Base
  after_filter :save_action
  # ...  other logic

  def save_action
    a = Action.where(controller: params[:controller], action_name: params[:action]).first_or_create
    a.increment!(:count)
  end
end