/etc/logcheck/ignore.d.server/clamav-freshclam is in clamav-freshclam 0.99+dfsg-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 | ^\w{3} [ :0-9]{11} [._[:alnum:]-]+ freshclam\[[0-9]+\]: ClamAV update process started at .*$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ freshclam\[[0-9]+\]: Received signal: (wake up|re-opening log file)$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ freshclam\[[0-9]+\]: (daily|main)\.c(l|v)d (is up to date|updated) \(version: [0-9]+, sigs: [0-9]+, f-level: [0-9]+, builder: \w+\)$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ freshclam\[[0-9]+\]: Clamd successfully notified about the update\.$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ freshclam\[[0-9]+\]: --------------------------------------$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ freshclam\[[0-9]+\]: Database updated \([0-9]+ signatures\) from .* \(IP: [0-9.]+\)$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ freshclam\[[0-9]+\]: Downloading daily-[0-9]+.cdiff \[100%\] ?$
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