def _construct_path_with_prefix(self, *keys: str) -> str:
        """Return sequence of keys joined by `LOGGER_JOIN_CHAR`, started with `_prefix` if defined."""
        if self._prefix:
            return self.LOGGER_JOIN_CHAR.join([self._prefix, *keys])
        return self.LOGGER_JOIN_CHAR.join(keys)
Return sequence of keys joined by `LOGGER_JOIN_CHAR`, started with `_prefix` if defined.
src/lightning/pytorch/loggers/neptune.py