The following warning message appears during the pre-upgrade check in Stage 2 of the VCSA upgrade:
Warning
This vCenter Server has extensions registered that cannot be upgraded to or may not work with the new vCenter Server. Extensions: com.vmware.vrops (by VMware) on https://##.##.##.##/vropsPlugin.zip, vRealize Operation Manager (by VMware) on https://##.##.##.##/vropsPlugin.zip
Resolution
Please ensure extensions are compatible with the new vCenter Server and re-register extensions with the new vCenter Server after upgrade. Please refer to the vSphere documentation on extensions, and the upgrade and interoperability guides.
VMware vCenter Server
VMware Aria Operations 8.x
This is caused by old plugins remaining on the source vCenter Server.
Re-register the VMware Aria Operations Plugin following the KB 338384.
Refer KB Integrating the Aria Operations plugin with vCenter Server for more details.