The tag is present in Lintian version 2.104.244. That is the most recent version we know about.
Debian packages should not install into
/srv states that its structure is at the
discretion of the local administrator and no package should rely on any
particular structure. Debian packages that install files directly into
/srv can't adjust for local policy about its structure and in
essence force a particular structure.
If a package wishes to put its data in
/srv, it must do this in
a way that allows the local administrator to specify and preserve their
chosen directory structure (such as through post-install configuration,
setup scripts, debconf prompting, etc.).
Refer to Filesystem Hierarchy Standard for details.