docstr: Returns the name of the metadata field.
docstr_tok: ["Returns","the","name","of","the","metadata","field","."]
code: def metadata_name(self) -> Optional[str]:
      """Returns the name of the metadata field."""
      if self.field.startswith("metadata."):
          return self.field.split("metadata.")[1]
  
imports: import warnings
  from typing import TYPE_CHECKING, Any, Dict, List, Literal, Optional, Tuple, Union
  from uuid import UUID
  from argilla.client.feedback.schemas.enums import RecordSortField, ResponseStatus, SortOrder
  from argilla.pydantic_v1 import BaseModel, Extra, Field, PrivateAttr, StrictInt, StrictStr, conint, validator
label_desc: Use image node_id 4 for calling the SortBy obj's underlying member method code with example usage: obj.metadata_name() and returns: self