docstr: A nonnegative measure of the free cores in millicpu.
  
  free_cores_mcpu can be negative temporarily if the worker is oversubscribed.
docstr_tok: ["A","nonnegative","measure","of","the","free","cores","in","millicpu",".","free_cores_mcpu","can","be","negative","temporarily","if","the","worker","is","oversubscribed","."]
code: def free_cores_mcpu_nonnegative(self):
      """A nonnegative measure of the free cores in millicpu.
  
      free_cores_mcpu can be negative temporarily if the worker is oversubscribed.
      """
      return max(0, self.free_cores_mcpu)
  
imports: import base64
  import json
  import logging
  import secrets
  from typing import Dict, Optional
  import aiohttp
  from gear import Database, transaction
  from hailtop import httpx
  from hailtop.humanizex import naturaldelta_msec
  from hailtop.utils import retry_transient_errors, time_msecs, time_msecs_str
  from ..cloud.utils import instance_config_from_config_dict
  from ..globals import INSTANCE_VERSION
  from ..instance_config import InstanceConfig
label_desc: Use image node_id 5 for calling the Instance obj's underlying member method code with example usage: obj.free_cores_mcpu_nonnegative() and returns: max