/usr/share/php/Icinga/Exception/ is in php-icinga 2.4.1-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/php/Icinga/Exception/AlreadyExistsException.php
/usr/share/php/Icinga/Exception/AuthenticationException.php
/usr/share/php/Icinga/Exception/ConfigurationError.php
/usr/share/php/Icinga/Exception/Http/
/usr/share/php/Icinga/Exception/Http/HttpBadRequestException.php
/usr/share/php/Icinga/Exception/Http/HttpException.php
/usr/share/php/Icinga/Exception/Http/HttpMethodNotAllowedException.php
/usr/share/php/Icinga/Exception/Http/HttpNotFoundException.php
/usr/share/php/Icinga/Exception/IcingaException.php
/usr/share/php/Icinga/Exception/InvalidPropertyException.php
/usr/share/php/Icinga/Exception/MissingParameterException.php
/usr/share/php/Icinga/Exception/NotFoundError.php
/usr/share/php/Icinga/Exception/NotImplementedError.php
/usr/share/php/Icinga/Exception/NotReadableError.php
/usr/share/php/Icinga/Exception/NotWritableError.php
/usr/share/php/Icinga/Exception/ProgrammingError.php
/usr/share/php/Icinga/Exception/QueryException.php
/usr/share/php/Icinga/Exception/StatementException.php
/usr/share/php/Icinga/Exception/SystemPermissionException.php