Man pages matching name cpanplus::backend::rv in section 3pm:

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