This thread needs clarification - are you upgrading an installation, either by installing 8.0 directly onto a 7.9 system, or restoring a 7.9 backup to a running 8.0 gateway, or attempting to upgrade tags piecemeal using a tag export from 7.9 into 8.0?
The former should happen seamlessly - if it doesn’t, that’s a bug we need to fix.
The latter is something that I believe we don’t currently expect to be handled, although we theoretically could.