Indeed when upgrading to R80.x there is no pre-upgrade-verification report. However the pre-upgrade-verifier is still available for use and I recommend to use it.
There are 2 ways to run the pre-upgrade-verifier when upgrading to R81 (or lower version):
1. Gaia portal -> status and actions (CPUSE) -> right click on the desired version's package -> verify.
A pop-up window will present the pre-upgrade-verification result.
2. Run " $FWDIR/scripts/migrate_server verify -skip_upgrade_tools_check -v R81.10", the pre-upgrade-verification result will be printed to the screen
In R81.10 new Management APIs introduced - allowing export, import, migration and upgrade of full Management server or only a single domain from an MDS.
So when upgrading to R81.10 pre-upgrade-verification can be done also using export-management API.
Very soon an enhanced upgrade report will be introduced including a brand new section for pre-upgrade-verification, in addition to the existing sections of export and import.
This enhanced upgrade report will be released in one of the next upgrade tools packages for R81 and R81.10.
It will be published in sk163814 once released.