code: def test_user_logs(serve_instance):
      logger = logging.getLogger("ray.serve")
      stderr_msg = "user log message"
      log_file_msg = "in file only"
      name = "user_fn"
  
      @serve.deployment(name=name)
      def fn(*args):
          logger.info(stderr_msg)
          logger.info(log_file_msg, extra={"log_to_stderr": False})
          return (
              serve.get_replica_context().replica_tag,
              logger.handlers[1].baseFilename,
          )
  
      handle = serve.run(fn.bind())
  
      f = io.StringIO()
      with redirect_stderr(f):
          replica_tag, log_file_name = handle.remote().result()
  
          def check_stderr_log(replica_tag: str):
              s = f.getvalue()
              app_name, deployment_name, replica_id = replica_tag.split(
                  "#"
              )
              return all(
                  [
                      name in s,
                      _get_expected_replica_log_content(replica_tag)
                      in s,
                      stderr_msg in s,
                      log_file_msg not in s,
                  ]
              )
  
          # Only the stderr_msg should be logged to stderr.
          wait_for_condition(check_stderr_log, replica_tag=replica_tag)
  
          def check_log_file(replica_tag: str):
              with open(log_file_name, "r") as f:
                  s = f.read()
                  return all(
                      [
                          name in s,
                          _get_expected_replica_log_content(replica_tag)
                          in s,
                          stderr_msg in s,
                          log_file_msg in s,
                      ]
                  )
  
          # Both messages should be logged to the file.
          wait_for_condition(check_log_file, replica_tag=replica_tag)
  
imports: import io
  import json
  import logging
  import os
  import re
  import string
  import sys
  import time
  from contextlib import redirect_stderr
  import pytest
  import requests
  import starlette
  import ray
  import ray.util.state
  from ray import serve
  from ray._private.test_utils import wait_for_condition
  from ray.serve._private.common import ServeComponentType
  from ray.serve._private.constants import SERVE_LOG_EXTRA_FIELDS
  from ray.serve._private.logging_utils import ServeJSONFormatter, get_component_log_file_name, get_serve_logs_dir
label_desc: Use image node_id 6 for calling a global function with example usage: test_user_logs(serve_instance) and returns: serve,  logger, all, all