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
Emitted (non-overridden): 1, overridden: 0, total: 1
The package names link to the relevant maintainer page and the corresponding report for the source package. The links go to the full maintainer report page, which includes info and experimental tags and overridden tags, rather than the default page that shows only errors and warnings.