Hi,
Those log messages are normal. UD contains PHP code that requests the memory ceiling to be raised (to give backups maximum chance of succeeding - since backups need to deal with big zip files). The code respects the setting of WP_MAX_MEMORY_LIMIT, so, if you don't want the memory ceiling to be raised, then set that in your wp-config.php.
i.e. The messages are being logged because your WP_MAX_MEMORY_LIMIT is set to one thing (possibly the default), but your Suhosin configuration is set to something different.
David