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: ems_event.rb
    path of file: ./repos/manageiq/app/models
    
    the code of the file until where you have to start completion: class EmsEvent < EventStream
  include Automate

  CLONE_TASK_COMPLETE = "CloneVM_Task_Complete"
  SOURCE_DEST_TASKS = [
    'CloneVM_Task',
    'MarkAsTemplate',
    'MigrateVM_Task',
    'RelocateVM_Task',
    'Rename_Task',
  ]

  CLASS_GROUP_LEVELS = %i[critical warning].freeze

  def self.description
    _("Management Eve
    
  def self.event_groups
    @event_groups ||= begin
      core_event_groups = ::Settings.event_handling.event_groups.to_hash
      Settings.ems.each_with_object(core_event_groups) do |(_provider_type, provider_settings), event_groups|
        provider_event_groups = provider_settings.fetch_path(:event_handling, :event_groups)
        next unless provider_event_groups

        DeepMerge.deep_merge!(
          provider_event_groups.to_hash, event_groups,
          :preserve_unmergeables => false,
          :overwrite_arrays      => false
        )
      end
    end