All reports of postrm-does-not-purge-debconf for the archive. The extended description of this tag is:

Packages using debconf should call db_purge or its equivalent in their postrm. If the package uses debhelper, dh_installdebconf(1) should take care of this.

Severity: normal, Certainty: certain

Check: debconf, Type: binary, udeb, source

This tag has not been emitted in any package tested by Lintian.