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: observer.rb
    path of file: ./repos/artichoke/artichoke-backend/vendor/ruby/lib/drb
    
    the code of the file until where you have to start completion: # frozen_string_literal: false
require 'observer'

module DRb
  # The Observable module extended to DRb.  See Observable 
    
    def notify_observers(*arg)
      if defined? @observer_state and @observer_state
        if defined? @observer_peers
          @observer_peers.each do |observer, method|
            begin
              observer.__send__(method, *arg)
            rescue
              delete_observer(observer)
            end
          end