/usr/include/OTF_CopyHandler.h is in libotf-trace-dev 1.12.5+dfsg-2build1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/include/open-trace-format/OTF_CopyHandler.h
/usr/include/open-trace-format/OTF_CopyHandler.h