Update announcement timestamp in onu.md and enhance logger formatting to preserve original message and levelname. Remove outdated onu.md file and log files, and add type hints in main.py for better code clarity.

gx_gp_monitor/main.py

@@ -8,6 +8,7 @@ import sys
 import argparse
 import signal
 from pathlib import Path
+from typing import Dict, Any
 
 # 添加项目根目录到Python路径
 project_root = Path(__file__).parent