/usr/share/lintian/overrides/xfce4-cpugraph-plugin is in xfce4-cpugraph-plugin 1.0.5-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | # we do build with hardening flags
xfce4-cpugraph-plugin: hardening-no-fortify-functions usr/lib/x86_64-linux-gnu/xfce4/panel/plugins/libcpugraph.so
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