code: def test_log_pid_with_hex_job_id(ray_start_cluster):
      cluster = ray_start_cluster
      cluster.add_node(num_cpus=4)
  
      def submit_job():
          # Connect a driver to the Ray cluster.
          ray.init(address=cluster.address, ignore_reinit_error=True)
          p = init_log_pubsub()
          # It always prints the monitor messages.
          logs = get_log_message(p, 1)
  
          @ray.remote
          def f():
              print("remote func")
  
          ray.get(f.remote())
  
          def matcher(log_batch):
              return log_batch["task_name"] == "f"
  
          logs = get_log_batch(p, 1, matcher=matcher)
          # It should logs with pid of hex job id instead of None
          assert logs[0]["pid"] is not None
          ray.shutdown()
  
      # NOTE(xychu): loop ten times to make job id from 01000000 to 0a000000,
      #              in order to trigger hex pattern
      for _ in range(10):
          submit_job()
  
imports: import io
  import os
  import re
  import subprocess
  import sys
  import tempfile
  import time
  import logging
  from collections import Counter, defaultdict
  from contextlib import redirect_stderr, redirect_stdout
  from pathlib import Path
  from unittest.mock import Mock, MagicMock
  import pytest
  import ray
  from ray._private import ray_constants
  from ray._private.log_monitor import LOG_NAME_UPDATE_INTERVAL_S, RAY_LOG_MONITOR_MANY_FILES_THRESHOLD, LogFileInfo, LogMonitor, is_proc_alive
  from ray._private.test_utils import get_log_batch, get_log_message, get_log_data, init_log_pubsub, run_string_as_driver, wait_for_condition
  from ray.cross_language import java_actor_class
  from ray.autoscaler._private.cli_logger import cli_logger
label_desc: Use image node_id 9 for calling a global function with example usage: test_log_pid_with_hex_job_id(ray_start_cluster) and returns: unknown