def METHOD_NAME(
    title: str,
    description: str,
    labels: Optional[List[str]] = None,
    existing_issue_number: Optional[int] = None,
) -> Tuple[int, str]:
  """
  Comments the description on the existing issue (if provided and still open),
   or creates a new issue.
  """
  if existing_issue_number is not None:
    commented_on_issue, issue_url = comment_on_issue(
          issue_number=existing_issue_number,
          comment_description=description
          )
    if commented_on_issue:
      add_awaiting_triage_label(issue_number=existing_issue_number)
      return existing_issue_number, issue_url
  return create_issue(title=title, description=description, labels=labels)