/usr/ is in libsysactivity-dev 0.6.5-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/
/usr/share/doc/
/usr/share/doc/libsysactivity-dev/
/usr/share/doc/libsysactivity-dev/copyright
/usr/lib/
/usr/lib/cmake/
/usr/lib/cmake/libsysactivity/
/usr/lib/cmake/libsysactivity/libsysactivityConfig.cmake
/usr/lib/cmake/libsysactivity/libsysactivityConfigVersion.cmake
/usr/include/
/usr/include/libsysactivity/
/usr/include/libsysactivity/cpu.h
/usr/include/libsysactivity/network.h
/usr/include/libsysactivity/global.h
/usr/include/libsysactivity/disk.h
/usr/include/libsysactivity/process.h
/usr/include/libsysactivity/memory.h
/usr/include/libsysactivity/swap.h
/usr/include/libsysactivity/libsysactivity.h
/usr/share/doc/libsysactivity-dev/changelog.Debian.gz
/usr/lib/libsysactivity.so