/usr/ is in icinga2-ido-mysql 2.6.0-2+deb9u1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/icinga2/
/usr/lib/x86_64-linux-gnu/icinga2/libdb_ido_mysql.so.2.6.0
/usr/share/
/usr/share/dbconfig-common/
/usr/share/dbconfig-common/data/
/usr/share/dbconfig-common/data/icinga2-ido-mysql/
/usr/share/dbconfig-common/data/icinga2-ido-mysql/install/
/usr/share/dbconfig-common/data/icinga2-ido-mysql/install/mysql
/usr/share/dbconfig-common/data/icinga2-ido-mysql/upgrade/
/usr/share/dbconfig-common/data/icinga2-ido-mysql/upgrade/mysql/
/usr/share/dbconfig-common/data/icinga2-ido-mysql/upgrade/mysql/2.0.2
/usr/share/dbconfig-common/data/icinga2-ido-mysql/upgrade/mysql/2.1.0
/usr/share/dbconfig-common/data/icinga2-ido-mysql/upgrade/mysql/2.2.0
/usr/share/dbconfig-common/data/icinga2-ido-mysql/upgrade/mysql/2.3.0
/usr/share/dbconfig-common/data/icinga2-ido-mysql/upgrade/mysql/2.4.0
/usr/share/dbconfig-common/data/icinga2-ido-mysql/upgrade/mysql/2.5.0
/usr/share/dbconfig-common/data/icinga2-ido-mysql/upgrade/mysql/2.6.0
/usr/share/doc/
/usr/share/doc/icinga2-ido-mysql/
/usr/share/doc/icinga2-ido-mysql/changelog.Debian.gz
/usr/share/doc/icinga2-ido-mysql/changelog.gz
/usr/share/doc/icinga2-ido-mysql/copyright
/usr/share/icinga2/
/usr/share/icinga2/tmpl/
/usr/share/icinga2/tmpl/ido-mysql.conf-sample
/usr/share/icinga2-ido-mysql/
/usr/share/icinga2-ido-mysql/schema/
/usr/share/icinga2-ido-mysql/schema/mysql.sql
/usr/share/icinga2-ido-mysql/schema/upgrade/
/usr/share/icinga2-ido-mysql/schema/upgrade/2.0.2.sql
/usr/share/icinga2-ido-mysql/schema/upgrade/2.1.0.sql
/usr/share/icinga2-ido-mysql/schema/upgrade/2.2.0.sql
/usr/share/icinga2-ido-mysql/schema/upgrade/2.3.0.sql
/usr/share/icinga2-ido-mysql/schema/upgrade/2.4.0.sql
/usr/share/icinga2-ido-mysql/schema/upgrade/2.5.0.sql
/usr/share/icinga2-ido-mysql/schema/upgrade/2.6.0.sql
/usr/lib/x86_64-linux-gnu/icinga2/libdb_ido_mysql.so