/usr/share/zabbix/api/classes/ is in zabbix-frontend-php 1:1.8.11-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/zabbix/api/classes/class.apiexception.php
/usr/share/zabbix/api/classes/class.caction.php
/usr/share/zabbix/api/classes/class.calert.php
/usr/share/zabbix/api/classes/class.capiinfo.php
/usr/share/zabbix/api/classes/class.capplication.php
/usr/share/zabbix/api/classes/class.cdcheck.php
/usr/share/zabbix/api/classes/class.cdhost.php
/usr/share/zabbix/api/classes/class.cdrule.php
/usr/share/zabbix/api/classes/class.cdservice.php
/usr/share/zabbix/api/classes/class.cevent.php
/usr/share/zabbix/api/classes/class.cgraph.php
/usr/share/zabbix/api/classes/class.cgraphitem.php
/usr/share/zabbix/api/classes/class.chistory.php
/usr/share/zabbix/api/classes/class.chost.php
/usr/share/zabbix/api/classes/class.chostgroup.php
/usr/share/zabbix/api/classes/class.cimage.php
/usr/share/zabbix/api/classes/class.citem.php
/usr/share/zabbix/api/classes/class.citemkey.php
/usr/share/zabbix/api/classes/class.cmaintenance.php
/usr/share/zabbix/api/classes/class.cmap.php
/usr/share/zabbix/api/classes/class.cmediatype.php
/usr/share/zabbix/api/classes/class.cproxy.php
/usr/share/zabbix/api/classes/class.cscreen.php
/usr/share/zabbix/api/classes/class.cscreenitem.php
/usr/share/zabbix/api/classes/class.cscript.php
/usr/share/zabbix/api/classes/class.ctemplate.php
/usr/share/zabbix/api/classes/class.ctrigger.php
/usr/share/zabbix/api/classes/class.ctriggerexpression.php
/usr/share/zabbix/api/classes/class.cuser.php
/usr/share/zabbix/api/classes/class.cusergroup.php
/usr/share/zabbix/api/classes/class.cusermacro.php
/usr/share/zabbix/api/classes/class.czbxapi.php