Man pages matching name sys::statistics::linux::procstats in section 3pm:

Sys::Statistics::Linux::ProcStats.3pm.en	debian 10 / libsys-statistics-linux-perl
Sys::Statistics::Linux::ProcStats.3pm.en	debian 11 / libsys-statistics-linux-perl
Sys::Statistics::Linux::ProcStats.3pm.en	debian 12 / libsys-statistics-linux-perl