Why does the memory usage of a VM persist in 100% on its performance monitoring page?

Why does the memory usage of a VM persist in 100% on its performance monitoring page?

This issue might occur because the VM is not installed with CAStool. Without CAStool, the memory usage displayed on the page is calculated based on the memory allocated to the VM. This calculation always yields a memory usage of 100%. To resolve this issue, install CAStools on the VM and make sure its version is compatible with UIS Manager.