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: Wait for TPU to become healthy or raise error if timeout reached.
  
  Args:
    timeout_s (int): The timeout in seconds for waiting TPU to become healthy.
    interval (int): The interval in seconds to poll the TPU for health.
  
  Raises:
    RuntimeError: If the TPU doesn't become healthy by the timeout.
code: def wait_for_healthy(self, timeout_s=1200, interval=30):
      """Wait for TPU to become healthy or raise error if timeout reached.
  
      Args:
        timeout_s (int): The timeout in seconds for waiting TPU to become healthy.
        interval (int): The interval in seconds to poll the TPU for health.
  
      Raises:
        RuntimeError: If the TPU doesn't become healthy by the timeout.
      """
      timeout = time.time() + timeout_s
      while self.health() != "HEALTHY":
          logging.warning(
              (
                  'Waiting for TPU "%s" with state "%s" '
                  'and health "%s" to become healthy'
              ),
              self.name(),
              self.state(),
              self.health(),
          )
          if time.time() + interval > timeout:
              raise RuntimeError(
                  'Timed out waiting for TPU "%s" to become healthy'
                  % self.name()
              )
          time.sleep(interval)
  
      logging.warning('TPU "%s" is healthy.', self.name())
  
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 21 for calling the Client obj's underlying member method code with example usage: obj.wait_for_healthy(timeout_s, interval) without return types