/usr/share/php/Icinga/Application/ is in php-icinga 2.1.0-1ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/php/Icinga/Application/ApplicationBootstrap.php
/usr/share/php/Icinga/Application/Benchmark.php
/usr/share/php/Icinga/Application/ClassLoader.php
/usr/share/php/Icinga/Application/Cli.php
/usr/share/php/Icinga/Application/Config.php
/usr/share/php/Icinga/Application/EmbeddedWeb.php
/usr/share/php/Icinga/Application/Hook/
/usr/share/php/Icinga/Application/Hook.php
/usr/share/php/Icinga/Application/Hook/GrapherHook.php
/usr/share/php/Icinga/Application/Hook/TicketHook.php
/usr/share/php/Icinga/Application/Hook/WebBaseHook.php
/usr/share/php/Icinga/Application/Icinga.php
/usr/share/php/Icinga/Application/LegacyWeb.php
/usr/share/php/Icinga/Application/Logger/
/usr/share/php/Icinga/Application/Logger.php
/usr/share/php/Icinga/Application/Logger/LogWriter.php
/usr/share/php/Icinga/Application/Logger/Writer/
/usr/share/php/Icinga/Application/Logger/Writer/FileWriter.php
/usr/share/php/Icinga/Application/Logger/Writer/StdoutWriter.php
/usr/share/php/Icinga/Application/Logger/Writer/SyslogWriter.php
/usr/share/php/Icinga/Application/Modules/
/usr/share/php/Icinga/Application/Modules/DashboardContainer.php
/usr/share/php/Icinga/Application/Modules/Manager.php
/usr/share/php/Icinga/Application/Modules/MenuItemContainer.php
/usr/share/php/Icinga/Application/Modules/Module.php
/usr/share/php/Icinga/Application/Modules/NavigationItemContainer.php
/usr/share/php/Icinga/Application/Platform.php
/usr/share/php/Icinga/Application/Version.php
/usr/share/php/Icinga/Application/Web.php
/usr/share/php/Icinga/Application/functions.php
/usr/share/php/Icinga/Application/webrouter.php