The tag is present in Lintian version 2.104.234. That is the most recent version we know about.
Debian packages should not install files under
/etc/apt/sources.list.d/ or install an
The selection of installation sources is under the control of the local administrator. Packages are generally not allowed to change the administrator's choices.
As a limited exception for the convenience of administrators,
packages whose names end in the clearly named
-apt-source are permitted to install such files.
Refer to the sources.list(5) manual page for details.