/etc/apitrace.d/x86_64-linux-gnu.conf is in apitrace-gl-tracers 3.0+git20121018.d1c301f7-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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/usr/lib/x86_64-linux-gnu/apitrace/wrappers