With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cghMonKalPositiveProbes
Cisco GSLB Health Monitor Keepalive Positive Probes
1.3.6.1.4.1.9.9.600.1.4.3.1.4
This object specifies the total number of keepalive probes sent to the remote device, identified by cgdAnswerAddress object, that resulted in a positive response.
Back to CISCO-GSLB-HEALTH-MON-MIB MIB page.
IPHost Network monitor allows you to monitor cghMonKalPositiveProbes 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.