/usr/share/lintian/overrides/bootchart2 is in bootchart2 0.14.4-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | # it's intentional, indeed.
bootchart2: package-contains-empty-directory lib/bootchart/tmpfs/
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