code: def parse_plugin_metadata(content):
    
    if not isinstance(content, bytes):
      raise TypeError('Content type must be bytes')
    result = plugin_data_pb2.PrCurvePluginData.FromString(content)
    if result.version == 0:
      return result
    else:
      logger.warn(
          'Unknown metadata version: %s. The latest version known to '
          'this build of TensorBoard is %s; perhaps a newer build is '
          'available?', result.version, PROTO_VERSION)
      return result
docs: Parse summary metadata to a Python object.
  
    Arguments:
      content: The `content` field of a `SummaryMetadata` proto
        corresponding to the pr_curves plugin.
  
    Returns:
      A `PrCurvesPlugin` protobuf object.