With IPHost Network Monitor you can run simple snmp requests against a Fortinet device in your network.
fgAppIMStatsEntry
fg App IM Stats Entry
1.3.6.1.4.1.12356.101.10.110.1.1
IM statistics for a particular virtual domain
Back to FORTINET-FORTIGATE-MIB MIB page.
IPHost Network monitor allows you to monitor fgAppIMStatsEntry 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.