code: def iowait():
      cpu_percent = psutil.cpu_times_percent()
      try:
          return cpu_percent.iowait
      except AttributeError:
          return None
  
imports: import logging
  import math
  import os
  import subprocess
  import sys
  import time
  from collections import namedtuple
  from typing import List, Optional
  import psutil
  from .lib import nvutils
  from ._resource import Resource, ZeroResource
  from .utils import get_bool_environ
label_desc: Use image node_id 8 for calling a global function with example usage: iowait() and returns: cpu_percent, None