Man pages matching name plack::session::cleanup in section 3pm:

Plack::Session::Cleanup.3pm.en	debian 10 / libplack-middleware-session-perl
Plack::Session::Cleanup.3pm.en	debian 11 / libplack-middleware-session-perl
Plack::Session::Cleanup.3pm.en	debian 12 / libplack-middleware-session-perl