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: metrics_finder.rb
    path of file: ./repos/gitlabhq/app/finders/merge_request
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

class MergeRequest::MetricsFinder
  include Gitlab::Allowable

  def initialize(cur
    
  def execute
    return klass.none if target_project.blank? || user_not_authorized?

    items = init_collection
    items = by_target_project(items)
    items = by_merged_after(items)
    by_merged_before(items)
  end