This initializer would replace all the modifications to the controllers

config\initializers\action_logger.rb

# No need to require aquarium; adding aquarium to the Gemfile takes care of that

class ActionController::Base
  include Aquarium::DSL
  around :methods => :all do |join_point, object, *args|
    logger.info "[info] Entering: #{join_point.target_type.name}##{join_point.method_name}: object = #{object}, args = #{args}" 
    result = join_point.proceed
    logger.info "[info] Leaving: #{join_point.target_type.name}##{join_point.method_name}: object = #{object}, args = #{args}" 
    result  # block needs to return the result of the "proceed"!
  end
end

:methods => :all does public methods only by default (the actions), which is exactly what we want.