With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
csgUserCurrEntries
Cisco Content Services Gateway User Current Entries
1.3.6.1.4.1.9.9.331.1.2.1.1.4
Current number of user table entries.
Back to CISCO-CSG-MIB MIB page.
IPHost Network monitor allows you to monitor csgUserCurrEntries on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco multiplexers right now.