/usr/share/shinken-mod-webui/htdocs/images/sets is in shinken-mod-webui 1.0-3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/shinken-mod-webui/htdocs/images/../../../shinken/images/sets
/usr/share/shinken-mod-webui/htdocs/images/../../../shinken/images/sets