docs: def manage_event(self, event) -> None:
          """Received new metadata.
  
          Operation initialized means new event, also happens if reconnecting.
          Operation changed updates existing events state.
          """
          name = EVENT_NAME.format(
              topic=event[EVENT_TOPIC], source=event.get(EVENT_SOURCE_IDX))
  
          if event[EVENT_OPERATION] == 'Initialized' and name not in self.events:
  
              for event_class in EVENT_CLASSES:
                  if event_class.TOPIC in event[EVENT_TOPIC]:
                      self.events[name] = event_class(event)
                      self.signal('add', name)
                      return
  
              _LOGGER.debug('Unsupported event %s', event[EVENT_TOPIC])
  
          elif event[EVENT_OPERATION] == 'Changed' and name in self.events:
              self.events[name].state = event[EVENT_VALUE]