Man pages matching name cpanplus::selfupdate in section 3pm:

CPANPLUS::Selfupdate.3pm.en	debian 10 / libcpanplus-perl
CPANPLUS::Selfupdate.3pm.en	debian 11 / libcpanplus-perl
CPANPLUS::Selfupdate.3pm.en	debian 12 / libcpanplus-perl