docs: def add_handler(self, handler):
          ''' Add an additional handler
  
          Args:
              handler:
                  A dictionary of handler configuration for the handler
                  that should be added. See :func:`__init__` for details
                  on valid parameters.
          '''
          handler['logger'] = self._get_logger(handler)
          handler['reads'] = 0
          handler['data_read'] = 0
  
          self.capture_handlers.append(handler)