/usr/ is in libdiagnostic-msgs-dev 1.12.5-3.
This file is owned by root:root, with mode 0o755.
..
/usr/include/
/usr/include/diagnostic_msgs/
/usr/include/diagnostic_msgs/AddDiagnostics.h
/usr/include/diagnostic_msgs/AddDiagnosticsRequest.h
/usr/include/diagnostic_msgs/AddDiagnosticsResponse.h
/usr/include/diagnostic_msgs/DiagnosticArray.h
/usr/include/diagnostic_msgs/DiagnosticStatus.h
/usr/include/diagnostic_msgs/KeyValue.h
/usr/include/diagnostic_msgs/SelfTest.h
/usr/include/diagnostic_msgs/SelfTestRequest.h
/usr/include/diagnostic_msgs/SelfTestResponse.h
/usr/lib/
/usr/lib/pkgconfig/
/usr/lib/pkgconfig/diagnostic_msgs.pc
/usr/share/
/usr/share/diagnostic_msgs/
/usr/share/diagnostic_msgs/cmake/
/usr/share/diagnostic_msgs/cmake/diagnostic_msgs-msg-extras.cmake
/usr/share/diagnostic_msgs/cmake/diagnostic_msgs-msg-paths.cmake
/usr/share/diagnostic_msgs/cmake/diagnostic_msgsConfig-version.cmake
/usr/share/diagnostic_msgs/cmake/diagnostic_msgsConfig.cmake
/usr/share/diagnostic_msgs/package.xml
/usr/share/doc/
/usr/share/doc/libdiagnostic-msgs-dev/
/usr/share/doc/libdiagnostic-msgs-dev/changelog.Debian.gz
/usr/share/doc/libdiagnostic-msgs-dev/copyright