/etc/smartmontools/run.d/60smart-notifier is in smart-notifier 0.28-5.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 | #!/bin/bash
[ -x /usr/bin/smart-notifier ] || exit 0
/usr/bin/smart-notifier --notify < "$1"
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