With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cmedxOverloadResourceStatsEntry
cmedx Overload Resource Stats Entry
1.3.6.1.4.1.9.10.104.1.2.8.1
Each entry contains the utilization statistics of the resource when the gateway is overloaded.
Back to CISCO-MEGACO-EXT-MIB MIB page.
IPHost Network monitor allows you to monitor cmedxOverloadResourceStatsEntry on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco firewalls right now.