Man pages matching name sys::hostname::long in section 3pm:

Sys::Hostname::Long.3pm.en	debian 10 / libsys-hostname-long-perl
Sys::Hostname::Long.3pm.en	debian 11 / libsys-hostname-long-perl
Sys::Hostname::Long.3pm.en	debian 12 / libsys-hostname-long-perl