/etc/logcheck/ignore.d.server/ntpdate is in ntpsec-ntpdate 1.1.0+dfsg1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 | ^\w{3} [ :0-9]{11} [._[:alnum:]-]+ ntpdate\[[0-9]+\]: (adjust|step) time server [0-9.]{7,15} offset -?[0-9.]+ sec$
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