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: custom.rb
    path of file: ./repos/query_track/lib/query_track/notifications
    
    the code of the file until where you have to start completion: module QueryTrack
  module Notifications
    class Custom
      attr_reader :code, :duration


    
      def call
        return unless QueryTrack::Settings.config.notifications.custom_handler

        trace = QueryTrack::Trace.new(caller).call

        QueryTrack::Settings.config.notifications.custom_handler.call(code, duration, trace)
      end