code: def _log_failed_submission(self, data):
          
          message = data.pop('message', '<no message value>')
          output = [message]
          if 'exception' in data and 'stacktrace' in data['exception']['values'][-1]:
              # try to reconstruct a reasonable version of the exception
              for frame in data['exception']['values'][-1]['stacktrace'].get('frames', []):
                  output.append('  File "%(fn)s", line %(lineno)s, in %(func)s' % {
                      'fn': frame.get('filename', 'unknown_filename'),
                      'lineno': frame.get('lineno', -1),
                      'func': frame.get('function', 'unknown_function'),
                  })
  
          self.uncaught_logger.error(output)
docs: Log a reasonable representation of an event that should have been sent
          to Sentry