docstr: Extract a recent pods resource version by reading the head pod's
  metadata.resourceVersion of the response.
docstr_tok: ["Extract","a","recent","pods","resource","version","by","reading","the","head","pod's","metadata.resourceVersion","of","the","response","."]
code: def _get_pods_resource_version(self) -> str:
      """
      Extract a recent pods resource version by reading the head pod's
      metadata.resourceVersion of the response.
      """
      if not RAY_HEAD_POD_NAME:
          return None
      pod_resp = self._get(f"pods/{RAY_HEAD_POD_NAME}")
      return pod_resp["metadata"]["resourceVersion"]
  
imports: import json
  import logging
  import os
  from collections import defaultdict
  from typing import Any, Dict, List, Optional, Tuple
  import requests
  from ray.autoscaler._private.constants import WORKER_LIVENESS_CHECK_KEY, WORKER_RPC_DRAIN_KEY
  from ray.autoscaler._private.util import NodeID, NodeIP, NodeKind, NodeStatus, NodeType
  from ray.autoscaler.batching_node_provider import BatchingNodeProvider, NodeData, ScaleRequest
  from ray.autoscaler.tags import NODE_KIND_HEAD, NODE_KIND_WORKER, STATUS_UP_TO_DATE, STATUS_UPDATE_FAILED, TAG_RAY_USER_NODE_TYPE
label_desc: Use image node_id 5 for calling the KubeRayNodeProvider obj's underlying member method code with example usage: obj._get_pods_resource_version() and returns: pod_resp, None