old_contents: from .service import DiscoveryService
  
  __meta__ = {
      "name": "Discovery server",
      "class": DiscoveryService,
      "deps": ["messaging"],
      "config": []
  }
  
new_contents: from .service import DiscoveryService
  
  __meta__ = {
      "name": "Discovery server",
      "class": DiscoveryService,
      "deps": ["messaging", "appmanager"],
      "config": []
  }
  
subject: Add appmanager dependency.