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This article describes the issue with ESXi Host when it displays 100% memory utilization.
All versions of NPM
This issue occurs when the information provided by device via SNMP is incorrect.
Total Memory is got from this OID: 126.96.36.199.4.1.68188.8.131.52.0
Used Memory From Each Process is got from 184.108.40.206.220.127.116.11.1.1.2.<index>
Total Used Memory is the sum of all the esults for 18.104.22.168.22.214.171.124.1.1.2.index
% Utilization = Total Used Memory / Total Memory * 100
In this instance, Total Used Memory is approximately equal to Total Memory making the result of 100% in Orion is correct. The issue is that the values from the device are incorrect
You need to poll the ESXi host via VmWare API.