ONTAP is a closed system and 100% of RAM will always be used as needed. Free RAM is wasted RAM. This is a paradigm shift from other systems, but important to know.
The only time this might be an issue is if you have a low memory EMS alert. If you are worried about a specific bug, especially if you hit it, work with your technical case owner to identify how to monitor specifically for this scenario. But this is a corner case, not applicable for 99% of situations.