code: def _extract_next_filename(self):
          
          self.ensure_metadata()
          metadata, body = self[-1]
          metadata['section'] = sanitize_section(metadata['section'])
          metadata['root'] = root
          path = "{root}/Misc/NEWS.d/next/{section}/{date}.bpo-{bpo}.{nonce}.rst".format_map(metadata)
          for name in "root section date bpo nonce".split():
              del metadata[name]
          return path
docs: changes metadata!