/etc/logcheck/ignore.d.server/hddtemp is in hddtemp 0.3-beta15-52.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | ^\w{3} [ :0-9]{11} [._[:alnum:]-]+ hddtemp\[[0-9]+\]: /dev/([hs]d[a-z]|sg[0-9]): .*: [0-9]+ [CF]$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ hddtemp\[[0-9]+\]: /dev/([hs]d[a-z]|sg[0-9]): .*: drive is sleeping$
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