code: def _healthz():
      """Health check endpoint used in the cloud FastAPI servers to check the status periodically."""
      return {"status": "ok"}
  
file_path: pytorch-lightning/src/lightning/app/frontend/web.py
imports: import multiprocessing
  from argparse import ArgumentParser
  from typing import Optional
  from urllib.parse import urljoin
  import uvicorn
  from fastapi import FastAPI
  from fastapi.middleware.cors import CORSMiddleware
  from starlette.staticfiles import StaticFiles
  from lightning.app.frontend.frontend import Frontend
  from lightning.app.utilities.log import get_logfile
  from lightning.app.utilities.network import find_free_network_port
label_desc: Use image node_id 1 for calling a global function with example usage: _healthz() and returns: dict