Custom SNMP monitor

Custom SNMP monitor

I need to have a monitor for "total connections" to CISO ASA 5500 series Firewall device.
I went to Monitors->Performance Monitors and selected Add Monitor.
Could not found a template for this option.
Then after I went to New Monitor from Admin ->Device Templates->New Monitor.
I could not found a value OID for this.
Could any one tell me which OID and MIB I should use.











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