/etc/logcheck/ignore.d.server/sslh is in sslh 1.15-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 | ^\w{3} [ :[:digit:]]{11} [._[:alnum:]-]+ (sslh|sslh-select)\[[[:digit:]]+\]: connection from [^[:space:]]+:[^[:space:]]+ to [^[:space:]]+:[^[:space:]]+ forwarded from [^[:space:]]+:[^[:space:]]+ to [^[:space:]]+:(https|ssh|openvpn)$
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