code: async def shutdown(self):
          
          if self._was_shutdown:
              return
          self._was_shutdown = True
  
          for handler in reversed(self.handlers):
              if not handler:
                  continue
              try:
                  if handler.initialized:
                      await handler.flush()
                      await handler.close()
  
              except Exception:
                  """
                  Ignore errors which might be caused
                  because handlers have been closed but
                  references to them are still around at
                  application exit. Basically ignore everything, 
                  as we're shutting down
                  """
                  pass
docs: Perform any cleanup actions in the logging system (e.g. flushing
          buffers).
  
          Should be called at application exit.