logging_config.json

{
    "version": 1,
    "disable_existing_loggers": false,
    "formatters": {
        "simple": {
            "format": "%(levelname)s: %(message)s"
        },
        "json": {
            "()": "logger.JsonFormatter",
            "fmt_keys": {
              "level": "levelname",
              "message": "message",
              "timestamp": "timestamp",
              "logger": "name",
              "module": "module",
              "function": "funcName",
              "line": "lineno",
              "thread_name": "threadName"
            }
          }
    },
    "handlers": {
        "file": {
            "class": "logging.handlers.RotatingFileHandler",
            "formatter": "json",
            "level": "DEBUG",
            "filename": "/var/log/fastapi/my_app.jsonl",
            "maxBytes": 200000,
            "backupCount": 5,
            "encoding": "utf-8"
        },
        "stderr": {
            "class": "logging.StreamHandler",
            "formatter": "simple",
            "level": "WARNING",
            "stream": "ext://sys.stderr"
        },
        "console": {
            "class": "logging.StreamHandler",
            "formatter": "simple",
            "level": "DEBUG",
            "stream": "ext://sys.stdout"
        },
        "queue_handler": {
            "class": "logging.handlers.QueueHandler",
            "handlers": ["console", "stderr", "file"],
            "respect_handler_level": true
        }
    },
    "loggers": {
        "main": {
            "level": "DEBUG", 
            "handlers": ["queue_handler"]
        },
        "gunicorn.error": {
            "level": "INFO",
            "handlers": ["file"],
            "propagate": false
        }
    }
}