message-8.x-1.1/message.services.yml

services:
  plugin.manager.message.purge:
    class: Drupal\message\MessagePurgePluginManager
    parent: default_plugin_manager
  message.purge_orchestrator:
    class: \Drupal\message\MessagePurgeOrchestrator
    arguments: ['@config.factory', '@entity_type.manager', '@plugin.manager.message.purge']