We have implemented remote JMX APMIA agents, we are getting the required metrics but unable to understand the Y axis in metrics view for few metrics.
JMX metrics is provided by the AppServer, we don't do any calculation.
There are various methods and commands you can use to validate that APM reports the correct JMX values, you can install another third-party JMX tool and query for the same metric, time and resolution.
Option 1: Use jcmd utility
Option 2: jhsdb jmap --heap --pid <java process PID>