code: def _FormatNotes(self, event):
      
      inode = event.inode
      if inode is None:
        inode = '-'
  
      notes = getattr(event, 'notes', '')
      if not notes:
        display_name = getattr(event, 'display_name', '')
        notes = 'File: {0:s} inode: {1!s}'.format(display_name, inode)
      return self._SanitizeField(notes)
docs: Formats the notes.
  
      Args:
        event (EventObject): event.
  
       Returns:
         str: formatted notes field.