Is there a MIB/OID for /var/log/ltm file size?

It's possible that there's one in the MIB2 tree, but I haven't seen anything like that in the F5 enterprise stuff. Filesystems are no problem (Host resources mib .1.3.6.1.2.1.25.3.8), but I've never tried individual files...

If there ISN'T a standard MIB you can always generate your own custom MIB (There's a 'Monitoring Big-IP System Traffic with SNMP' guide online on support.f5.com that tells you how. (The copy I have says 11.3.0 though, so I'm not 100% sure what version you need to be at to do this - basically you write routines in TCL that re called and return values for your custom OID's. Quite cool looking :) ).