/usr/share/icingaweb2/modules/monitoring/application/controllers/ is in icingaweb2-module-monitoring 2.1.0-1ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/icingaweb2/modules/monitoring/application/controllers/ActionsController.php
/usr/share/icingaweb2/modules/monitoring/application/controllers/AlertsummaryController.php
/usr/share/icingaweb2/modules/monitoring/application/controllers/ChartController.php
/usr/share/icingaweb2/modules/monitoring/application/controllers/CommentController.php
/usr/share/icingaweb2/modules/monitoring/application/controllers/CommentsController.php
/usr/share/icingaweb2/modules/monitoring/application/controllers/ConfigController.php
/usr/share/icingaweb2/modules/monitoring/application/controllers/DowntimeController.php
/usr/share/icingaweb2/modules/monitoring/application/controllers/DowntimesController.php
/usr/share/icingaweb2/modules/monitoring/application/controllers/HealthController.php
/usr/share/icingaweb2/modules/monitoring/application/controllers/HostController.php
/usr/share/icingaweb2/modules/monitoring/application/controllers/HostsController.php
/usr/share/icingaweb2/modules/monitoring/application/controllers/ListController.php
/usr/share/icingaweb2/modules/monitoring/application/controllers/ServiceController.php
/usr/share/icingaweb2/modules/monitoring/application/controllers/ServicesController.php
/usr/share/icingaweb2/modules/monitoring/application/controllers/ShowController.php
/usr/share/icingaweb2/modules/monitoring/application/controllers/TacticalController.php
/usr/share/icingaweb2/modules/monitoring/application/controllers/TimelineController.php