refactor(observability): Phase2.1 统一可观测基座 trace_id+结构化日志+span计时 [v2026.07.19.2]

backend/python/app/config.py

@@ -5,6 +5,7 @@ import os
 import logging
 from pathlib import Path
 from logging.handlers import TimedRotatingFileHandler
+from app.core.observability import TraceIdFilter, JsonFormatter
 from dotenv import load_dotenv
 
 # 加载 .env 文件（Docker 环境跳过，直接使用容器环境变量）
@@ -80,10 +81,14 @@ SLOW_REQUEST_THRESHOLD = float(os.getenv("SLOW_REQUEST_THRESHOLD", "3.0"))
 
 def setup_file_logging():
     """配置应用日志按天轮转输出到文件"""
-    log_format = logging.Formatter(
-        "%(asctime)s [%(levelname)s] %(name)s - %(message)s",
-        datefmt="%Y-%m-%d %H:%M:%S",
-    )
+    use_json = os.getenv("AIFLOW_JSON_LOGS", "0") == "1"
+    if use_json:
+        log_format = JsonFormatter()
+    else:
+        log_format = logging.Formatter(
+            "%(asctime)s [%(levelname)s] %(name)s [tid:%(trace_id)s] - %(message)s",
+            datefmt="%Y-%m-%d %H:%M:%S",
+        )
 
     # 应用日志 - 按天轮转，保留30天
     app_handler = TimedRotatingFileHandler(
@@ -123,10 +128,12 @@ def setup_file_logging():
     root_logger.setLevel(logging.INFO)
     root_logger.addHandler(app_handler)
     root_logger.addHandler(error_handler)
+    root_logger.addFilter(TraceIdFilter())
 
     # 配置访问日志专用logger
     access_logger = logging.getLogger("aiflow.access")
     access_logger.addHandler(access_handler)
     access_logger.propagate = False
+    access_logger.addFilter(TraceIdFilter())
 
     return access_logger