|  | --- | 
|  | features: | 
|  | - A new optional interface `TempestPlugin.get_service_clients` | 
|  | is available to plugins. It allows them to declare | 
|  | any service client they implement. For now this is used by | 
|  | tempest only, for auto-registration of service clients | 
|  | in the new class `ServiceClients`. | 
|  | - A new singleton class `clients.ClientsRegistry` is | 
|  | available. It holds the service clients registration data | 
|  | from all plugins. It is used by `ServiceClients` for | 
|  | auto-registration of the service clients implemented | 
|  | in plugins. |