After our discussion about uptime over SNMP I poked around a bit.

sysUpTime is indeed in the System MIB (required by all SNMP implementations), but

mini-snmpd has a bug.
Witness:

root@monitor1:~# snmpwalk -v1 -c public 10.1.1.1 1.3.6.1.2.1.1
iso.3.6.1.2.1.1.1.0 = ""
iso.3.6.1.2.1.1.2.0 = OID: iso.3.6.1.4.1
iso.3.6.1.2.1.1.3.0 = Timeticks: (936051) 2:36:00.51
iso.3.6.1.2.1.1.4.0 = STRING: "info@sudomesh.org"
iso.3.6.1.2.1.1.5.0 = STRING: "my.node"
iso.3.6.1.2.1.1.6.0 = STRING: "Omni"

Note the terminating zeros on the OIDs; they shouldn't be there.

1.3.6.1.2.1.1.3 is the correct OID for sysUpTime.

I'll look into fixing it. It looks like memory stats are similarly affected.

Alex