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: source_manager.rb
    path of file: ./repos/yacs/malg
    
    the code of the file until where you have to start completion: require './s
    
  def watch
    loop do
      @sources.each do |source|
        unless source.healthy?
          STDERR.puts "Error: #{source.name} failed healthcheck. Restarting..."
          source.start
        end
      end
      sleep WATCH_FREQUENCY
    end