/usr/share/lintian/overrides/alsa-source is in alsa-source 1.0.25+dfsg-0ubuntu5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | alsa-source: unused-debconf-template alsa-source/cards
alsa-source: unused-debconf-template alsa-source/cards_with_descriptions
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