import logging
import sys


class KeyValueFormatter(logging.Formatter):
    """Formats records as `LEVEL msg key1=val1 key2=val2`."""

    def format(self, record: logging.LogRecord) -> str:
        base = f"{record.levelname} {record.getMessage()}"
        # extras land in record.__dict__ but mixed with stdlib keys; filter to known-extra keys
        reserved = {
            "name", "msg", "args", "levelname", "levelno", "pathname", "filename",
            "module", "exc_info", "exc_text", "stack_info", "lineno", "funcName",
            "created", "msecs", "relativeCreated", "thread", "threadName",
            "processName", "process", "message", "taskName",
        }
        extras = {k: v for k, v in record.__dict__.items() if k not in reserved}
        if extras:
            base += " " + " ".join(f"{k}={v}" for k, v in extras.items())
        if record.exc_info:
            base += "\n" + self.formatException(record.exc_info)
        return base


def setup_logging(level: str = "INFO") -> None:
    handler = logging.StreamHandler(sys.stdout)
    handler.setFormatter(KeyValueFormatter())
    root = logging.getLogger()
    root.handlers.clear()
    root.addHandler(handler)
    root.setLevel(level.upper())