Man pages matching name sock_diag in section 7:

sock_diag.7.en	debian 10 / manpages
sock_diag.7.en	debian 11 / manpages
sock_diag.7.en	debian 12 / manpages
sock_diag.7.fr	debian 12 / manpages-fr
sock_diag.7.ru	debian 12 / manpages-ru