When registering a clustered NSX-T in Usage Meter, registering all individual NSX-T Manager nodes may lead to over-measurement for both NSX-T and vDefend firewall.
Usage Meter 9.0.x
When registering a clustered NSX-T Manager, register only the cluster VIP in Usage Meter.
If all NSX-T Manager nodes have already been registered, they must be deleted as this configuration is incorrect.
* Add an NSX-T Data Center Instance for vDefend for Metering in VCF Usage Meter
https://techdocs.broadcom.com/us/en/vmware-cis/vcf/usage-meter/9-0/vcf-usage-meter-deployment-and-administration-guide/managing-the-metering-in-um/add-nsx-t.html