code: def __init__(
      self,
      app,
      inst_coll,
      name,
      state,
      cores_mcpu,
      free_cores_mcpu,
      time_created,
      failed_request_count,
      last_updated: int,
      ip_address,
      version,
      location: str,
      machine_type: str,
      preemptible: bool,
      instance_config: InstanceConfig,
  ):
      self.db: Database = app["db"]
      self.client_session: httpx.ClientSession = app["client_session"]
      self.inst_coll = inst_coll
      # pending, active, inactive, deleted
      self._state = state
      self.name = name
      self.cores_mcpu = cores_mcpu
      self._free_cores_mcpu = free_cores_mcpu
      self.time_created = time_created
      self._failed_request_count = failed_request_count
      self._last_updated = last_updated
      self.ip_address = ip_address
      self.version = version
      self.location = location
      self.machine_type = machine_type
      self.preemptible = preemptible
      self.instance_config = instance_config
  
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 2 to create a new Instance object  with example: obj = Instance(app, inst_coll, name, state, cores_mcpu, free_cores_mcpu, time_created, failed_request_count, last_updated, ip_address, version, location, machine_type, preemptible, instance_config)