code: def version_metadata():
      """Creates gRPC invocation metadata encoding the TensorBoard version.
  
      Usage: `stub.MyRpc(request, metadata=version_metadata())`.
  
      Returns:
        A tuple of key-value pairs (themselves 2-tuples) to be passed as the
        `metadata` kwarg to gRPC stub API methods.
      """
      return ((_VERSION_METADATA_KEY, version.VERSION),)
  
imports: import enum
  import functools
  import random
  import threading
  import time
  import grpc
  from tensorboard import version
  from tensorboard.util import tb_logging
label_desc: Use image node_id 4 for calling a global function with example usage: version_metadata() and returns: _VERSION_METADATA_KEY,  version