$ git tag | grep 8.0
Percona-Server-5.5.27-28.0
Percona-Server-5.5.50-38.0
Percona-Server-5.6.20-68.0
Percona-Server-5.6.32-78.0
Percona-Server-5.6.48-88.0
Percona-Server-8.0.12-1.alpha
Percona-Server-8.0.12-2.rc1
Percona-Server-8.0.13-3
Percona-Server-8.0.13-4
Percona-Server-8.0.15-5
Percona-Server-8.0.15-6
Percona-Server-8.0.16-7
Percona-Server-8.0.17-8
Percona-Server-8.0.18-9
Percona-Server-8.0.19-10
Percona-Server-8.0.20-11
Percona-8.0.21-12 is released (https://www.percona.com/doc/percona-server/LATEST/release-notes/Percona-Server-8.0.21-12.html), but still not tagged yet?