Man pages matching name catalyst::engine::apache2::mp19 in section 3pm:

Catalyst::Engine::Apache2::MP19.3pm.en	debian 10 / libcatalyst-engine-apache-perl
Catalyst::Engine::Apache2::MP19.3pm.en	debian 11 / libcatalyst-engine-apache-perl
Catalyst::Engine::Apache2::MP19.3pm.en	debian 12 / libcatalyst-engine-apache-perl