text: from pretalx.common.signals import EventPluginSignal
  
  register_recording_provider = EventPluginSignal()
  """
  This signal is sent out to gather all known recording providers. Receivers
  should return a subclass of pretalx.agenda.recording.BaseRecordingProvider.
  
  As with all event plugin signals, the ``sender`` keyword argument will contain
  the event.
  """
  