Man pages matching name dpkg::deps::knownfacts in section 3perl:

Dpkg::Deps::KnownFacts.3perl.en	debian 10 / libdpkg-perl
Dpkg::Deps::KnownFacts.3perl.en	debian 11 / libdpkg-perl
Dpkg::Deps::KnownFacts.3perl.en	debian 12 / libdpkg-perl