The logic in "Memory Utilization" rule is simple, just compare the value of memory utilization with an expected value, then check whether it's required to raise an alarm. Actually disk caching is taken into account of memory utilization. In IC(Infrastructure), disk caching is considered as a part of free memory, regarding calculate memory utilization. Let's see below statements:
1. For below output mentioned in Linux Web Site 1, here free memory = free + buffers + cached, while used memory is 635, so memory utilization is 635/1504 or (1504 - free
memory[13 + 91 + 764])/1504 so we can think that disk caching is taken into account of memory utilization.
