code: def _version(cls, monitor):
      if cls.INFO is None:
          raise MetaflowException(
              "Missing Metaflow Service URL. "
              "Specify with METAFLOW_SERVICE_URL environment variable"
          )
      path = "ping"
      url = os.path.join(cls.INFO, path)
      for i in range(SERVICE_RETRY_COUNT):
          try:
              if monitor:
                  with monitor.measure("metaflow.service_metadata.get"):
                      resp = requests.get(
                          url, headers=SERVICE_HEADERS.copy()
                      )
              else:
                  resp = requests.get(
                      url, headers=SERVICE_HEADERS.copy()
                  )
          except:
              if monitor:
                  with monitor.count(
                      "metaflow.service_metadata.failed_request"
                  ):
                      if i == SERVICE_RETRY_COUNT - 1:
                          raise
              else:
                  if i == SERVICE_RETRY_COUNT - 1:
                      raise
              resp = None
          else:
              if resp.status_code < 300:
                  return resp.headers.get(
                      "METADATA_SERVICE_VERSION", None
                  )
              elif resp.status_code != 503:
                  raise ServiceException(
                      "Metadata request (%s) failed"
                      " (code %s): %s"
                      % (url, resp.status_code, resp.text),
                      resp.status_code,
                      resp.text,
                  )
          time.sleep(2**i)
      if resp:
          raise ServiceException(
              "Metadata request (%s) failed (code %s): %s"
              % (url, resp.status_code, resp.text),
              resp.status_code,
              resp.text,
          )
      else:
          raise ServiceException("Metadata request (%s) failed" % url)
  
imports: import os
  import random
  import requests
  import time
  from metaflow.exception import MetaflowException, MetaflowTaggingError, MetaflowInternalError
  from metaflow.metaflow_config import SERVICE_RETRY_COUNT, SERVICE_HEADERS, SERVICE_URL
  from metaflow.metadata import MetadataProvider
  from metaflow.metadata.heartbeat import HB_URL_KEY
  from metaflow.sidecar import Message, MessageTypes, Sidecar
  from metaflow.util import version_parse
label_desc: Use image node_id 24 for calling the ServiceMetadataProvider obj's underlying member method code with example usage: obj._version(cls, monitor) and returns: resp