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: chain.rb
    path of file: ./repos/newrelic-ruby-agent/lib/new_relic/agent/instrumentation/ethon
    
    the code of the file until where you have to start completion: # This file is distributed under New Relic's license terms.
# See https://github.com/newrelic/newrelic-ruby-agent/blob/main/LICENSE for complete details.
# frozen_string_literal: true

module NewRelic::Agent::Instrumentation
  module Ethon
    module Chain
      def self.instrument!
        ::Ethon::Easy.class_eval do
          include NewRelic::Agent::Instrumentation::Etho
    
      def self.instrument!
        ::Ethon::Easy.class_eval do
          include NewRelic::Agent::Instrumentation::Ethon::Easy

          alias_method(:fabricate_without_tracing, :fabricate)
          def fabricate(url, action_name, options)
            fabricate_with_tracing(url, action_name, options) { fabricate_without_tracing(url, action_name, options) }
          end

          alias_method(:headers_equals_without_tracing, :headers=)
          def headers=(headers)
            headers_equals_with_tracing(headers) { headers_equals_without_tracing(headers) }
          end

          alias_method(:perform_without_tracing, :perform)
          def perform(*args)
            perform_with_tracing(*args) { perform_without_tracing(*args) }
          end
        end

        ::Ethon::Multi.class_eval do
          include NewRelic::Agent::Instrumentation::Ethon::Multi

          alias_method(:perform_without_tracing, :perform)
          def perform(*args)
            perform_with_tracing(*args) { perform_without_tracing(*args) }
          end
        end
      end