You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: reporting.rb
    path of file: ./repos/railsdevs.com/app/models/open_startup
    
    the code of the file until where you have to start completion: module OpenStartup
  class Reporting
    def self.refresh
     
    
    def self.refresh
      metrics = new
      metrics.persist
      metrics.normalize
      metrics.calculate
      nil
    end