code: def get_internal_states(self):
      return {
          "head_node_registration_time_s": self._head_node_registration_time_s,
          "registered_nodes": len(DataSource.nodes),
          "registered_agents": len(DataSource.agents),
          "node_update_count": self._node_update_cnt,
          "module_lifetime_s": time.time() - self._module_start_time,
      }
  
imports: import asyncio
  import json
  import logging
  import time
  import grpc
  from itertools import chain
  import aiohttp.web
  import ray._private.utils
  from ray.dashboard.consts import GCS_RPC_TIMEOUT_SECONDS
  from ray.autoscaler._private.util import LoadMetricsSummary, get_per_node_breakdown_as_dict, parse_usage
  import ray.dashboard.consts
  import ray.dashboard.optional_utils
  import ray.dashboard.utils
  from ray._private import ray_constants
  from ray.core.generated import gcs_service_pb2, gcs_service_pb2_grpc, node_manager_pb2, node_manager_pb2_grpc
  from ray.dashboard.datacenter import DataOrganizer, DataSource
  from ray.dashboard.modules.node import node_consts
  from ray.dashboard.modules.node.node_consts import FREQUENTY_UPDATE_NODES_INTERVAL_SECONDS, FREQUENT_UPDATE_TIMEOUT_SECONDS
  from ray._private.ray_constants import DEBUG_AUTOSCALING_ERROR, DEBUG_AUTOSCALING_STATUS
  from ray.dashboard.utils import async_loop_forever
label_desc: Use image node_id 2 for calling the NodeHead obj's underlying member method code with example usage: obj.get_internal_states() and returns: dict