Man pages matching name sudoers_timestamp in section 5:

sudoers_timestamp.5.en	debian 10 / sudo
sudoers_timestamp.5.en	debian 10 / sudo-ldap
sudoers_timestamp.5.en	debian 11 / sudo
sudoers_timestamp.5.en	debian 11 / sudo-ldap
sudoers_timestamp.5.en	debian 12 / sudo
sudoers_timestamp.5.en	debian 12 / sudo-ldap