How the SW calculates Memory Utilization?

Good afternoon.

Does anyone know  how the SW calculates Memory Utilization?

The problem is as follows: I have a system with a high load of RAM, but they do not appear  in the "Nodes with High Memory Utilization".

I understand that to show a "Nodes with High Memory Utilization" the SW uses a SQL query , but what it looks like, where it is stored  and how can I change this query?