class_docstr: Client for working with the Cloud TPU API.
  
  This client is intended to be used for resolving tpu name to ip addresses.
  
  It's recommended to use this library as a contextlib to utilize all
  functionality.
docstr: Return the structured Symptom message.
code: def _symptom_msg(self, msg):
      """Return the structured Symptom message."""
      return "Symptom: " + msg
  
imports: from concurrent import futures
  import datetime
  import json
  import logging
  import os
  import time
  import urllib
  from absl import flags
label_desc: Use image node_id 2 for calling the Client obj's underlying member method code with example usage: obj._symptom_msg(msg) and returns: unknown