This article indicates the OID to use to monitor the number of sessions on the VDOM.
FortiGate, VDOMs.
The OID mentioned below can be used in the SNMP/PRTG monitoring tool to know the number of sessions on the VDOM:
.1.3.6.1.4.1.12356.101.11.2.2.1.1
Related articles:
Technical Tip: How to Configure FortiGate SNMP Agent for Monitoring
Technical Tip: The correct OID to monitor each interface state
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