code: def _worker_group_max_replicas(
      raycluster: Dict[str, Any], group_index: int
  ) -> Optional[int]:
      """Extract the maxReplicas of a worker group.
  
      If maxReplicas is unset, return None, to be interpreted as "no constraint".
      At time of writing, it should be impossible for maxReplicas to be unset, but it's
      better to handle this anyway.
      """
      return raycluster["spec"]["workerGroupSpecs"][group_index].get(
          "maxReplicas"
      )
  
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 11 for calling a global function with example usage: _worker_group_max_replicas(raycluster, group_index) and returns: raycluster