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: primary_host.rb
    path of file: ./repos/gitlabhq/lib/gitlab/database/load_balancing
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

module Gitlab
  module Database
    module LoadBalancing
      # A host that wraps the primary database connection.
      #
      # This 
    
        def offline!
          ::Gitlab::Database::LoadBalancing::Logger.warn(
            event: :host_offline,
            message: 'Marking primary host as offline'
          )

          nil
        end