Man pages matching name getopt::complete::compgen in section 3pm:

Getopt::Complete::Compgen.3pm.en	debian 10 / libgetopt-complete-perl
Getopt::Complete::Compgen.3pm.en	debian 11 / libgetopt-complete-perl
Getopt::Complete::Compgen.3pm.en	debian 12 / libgetopt-complete-perl