The tag is present in Lintian version 2.104.328. That is the most recent version we know about.
The package contains files left over from a Python build
process, such as cached output from
Users of your package probably do not need the files. Please rebuild
your package with a newer version of
Many of the files will disappear.
Usually, the files contain time-stamped data. They will prevent your package from being reproducible.