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: container_coroner.rb
    path of file: ./repos/kontena/agent/lib/kontena/actors
    
    the code of the file until where you have to start completion: module Kontena::Actors
  class ContainerCoroner
    
    def process
      prev = nil
      loop do
        ids = all_containers.map { |c| c.id }
        if prev
          diff = prev - ids
          report(diff) if diff.size > 0
        end
        prev = ids
        sleep INVESTIGATION_PERIOD
      end