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: stackprof.rb
    path of file: ./repos/newrelic-ruby-agent/test/performance/lib/performance/instrumentation
    
    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 Performance
  module Instrumentation
    class StackProfProfile < Instrumentor
      platforms :mri_22, :mri_23, :mri_24, :mri_25, :mri_26, :mri_27, :mri_30, :mri_31

      def self.setup
        require 'tmpdir'
        require 'stac
    
      def after(test, test_name)
        StackProf.stop

        output_dump_path = artifact_path(test, test_name, 'dump')
        StackProf.results(output_dump_path)
        @artifacts << output_dump_path

        results = Marshal.load(File.read(output_dump_path))
        output_dot_path = artifact_path(test, test_name, 'dot')
        report = StackProf::Report.new(results)
        File.open(output_dot_path, 'w') do |f|
          report.print_graphviz({}, f)
        end
        @artifacts << output_dot_path
      end