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UCD-SNMP-MIB uses INTEGER32 instead of COUNTER64 for memory OIDs which limits the reporting to 2 TiB (using KiB as the base).

Large modern servers often contain more than 2 TiB of memory leading to the OIDs rolling over and reporting negative values.

http://www.net-snmp.org/docs/mibs/ucdavis.html

We can't modify any value from UCD-SNMP-MIB, due this MIB isn't owned by Red Hat (owner is U.C.Davis, ECE Dept.).

Unless owner will change it to Counter64, we can't do it as downstream patch.

From upstream, this issue has been resolved by adding new <var>X values. (See https://github.com/net-snmp/net-snmp/blob/master/mibs/UCD-SNMP-MIB.txt#L642) 

This change is available in Fedora and RHEL-8 already. I'll prepare patch for RHEL-7.8.

Commit: http://pkgs.devel.redhat.com/cgit/rpms/net-snmp/commit/?h=rhel-7.8&id=c0b4f3bdec4f46ff49ffdaf3230305e8868ea175

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2020:1081