[Bug 251103] net-mgmt/net-snmp: memory patch lost after 5.7 to 5.9 upgrade

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=251103

            Bug ID: 251103
           Summary: net-mgmt/net-snmp: memory patch lost after 5.7 to 5.9
                    upgrade
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: zi at FreeBSD.org
          Reporter: ncrogers at gmail.com
          Assignee: zi at FreeBSD.org
             Flags: maintainer-feedback?(zi at FreeBSD.org)

Created attachment 219637
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=219637&action=edit
Add back patch-agent_mibgroup_hardware_memory_memory__freebsd.c.

In the upgrade from 5.7.3 to 5.9, the following MIB patch was removed:
patch-agent_mibgroup_hardware_memory_memory__freebsd.c.

This patch is, unfortunately, still necessary to correctly instrument "used"
and "free" memory via SNMP under FreeBSD, since "inactive" memory needs to be
reported along with "cache" in the "UCD-SNMP-MIB::memCached" OID. This change
was never upstreamed to net-snmp.

This issue is a repeat of the old PR:
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=148339

I've attached a patch that includes the old patch, which still applies cleanly.

As an aside, I'm not sure if "Laundry" memory needs to be reported in this MIB
or not as well? Can someone with more insight comment on this? Currently I am
using (memTotalReal - memAvailReal - memCached) to instrument "used" memory via
SNMP.

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