HI jfafinski
Have you check monitor memory usage via SNMP?
Total RAM in machine: .1.3.6.1.4.1.2021.4.5.0
Total RAM used: .1.3.6.1.4.1.2021.4.6.0
Total RAM Free: .1.3.6.1.4.1.2021.4.11.0
If these OIDs are not on your device, you can see the device MIBs for the correct OIDs.
To get all information to create then reports or graphics you can send all this information to Pandora FMS monitoring tool.
https://pandorafms.com/monitoring-solutions/network-monitoring/
Best Regards