From Fedora Project Wiki

There are a variety of things to do to EOL a Fedora Release.

koji

Bodhi

PackageDB

Set the release to be End of Life in the PackageDB. Currently, that's done with the following db query:

update collection set statuscode = 9 where name = 'Fedora' and version = '11'; 

Announcement

FESCo announces the closure of the release to the package maintainers.