code: def define_log_processors():
      
      # these processors should accept logger, method_name and event_dict
      # and return a new dictionary which will be passed as event_dict to the next one.
      return [
          structlog.processors.TimeStamper(fmt="iso"),
          _structlog_default_keys_processor,
          structlog.stdlib.PositionalArgumentsFormatter(),
          structlog.processors.StackInfoRenderer(),
          structlog.processors.format_exc_info,
      ]
docs: log processors that structlog executes before final rendering