Man pages matching name gettid in section 2:

gettid.2.en	debian 10 / manpages-dev
gettid.2.es	debian 10 / manpages-es
gettid.2.ja	debian 10 / manpages-ja-dev
gettid.2.en	debian 11 / manpages-dev
gettid.2.fr	debian 11 / manpages-fr-dev
gettid.2.ja	debian 11 / manpages-ja-dev
gettid.2.en	debian 12 / manpages-dev
gettid.2.es	debian 12 / manpages-es-dev
gettid.2.fr	debian 12 / manpages-fr-dev
gettid.2.ja	debian 12 / manpages-ja-dev
gettid.2.ru	debian 12 / manpages-ru-dev