With IPHost Network Monitor you can run simple snmp requests against a Fortinet device in your network.
fnLogHDLastAccTime
fn Log HD Last Acc Time
1.3.6.1.4.1.12356.9.2.1.1.2
The last access time of the log file on the hard disk
Back to FORTINET-MIB MIB page.
IPHost Network monitor allows you to monitor fnLogHDLastAccTime on Fortinet device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Fortinet firewalls right now.