Man pages matching name plack::handler::apache2::registry in section 3pm:

Plack::Handler::Apache2::Registry.3pm.en	debian 10 / libplack-perl
Plack::Handler::Apache2::Registry.3pm.en	debian 11 / libplack-perl
Plack::Handler::Apache2::Registry.3pm.en	debian 12 / libplack-perl