Man pages matching name authen::krb5::simple in section 3pm:

Authen::Krb5::Simple.3pm.en	debian 10 / libauthen-krb5-simple-perl
Authen::Krb5::Simple.3pm.en	debian 11 / libauthen-krb5-simple-perl
Authen::Krb5::Simple.3pm.en	debian 12 / libauthen-krb5-simple-perl