def METHOD_NAME(*args, **kwargs):
    assert self._indent > 0
    self._indent -= 1
    if logger.isEnabledFor(logging.INFO):
        s: str = "  " * self._indent
        s += f"[<-observed({suffix})] "
        s += ",".join((str(x) for x in args))
        for k, v in kwargs.items():
            s += f"{k}->{v}"
        logger.info(s)