1. Create a custom counter and using the script below:
SELECT FreePhysicalMemory FROM Win32_OperatingSystem
2. WQL does not support mathematical operators, so we cannot calculate percentage directly. If the total physical memory is 8 GB and you want to get an alarm when the free physical pct is below 10%, you can set the severities like this (the value of FreePhysicalMemory is in KB):
Normal 838860.8 (empty) (empty)
High -1 838860.8 Low free physical memory
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