This file is indexed.

/etc/logcheck/ignore.d.server/ntpdate is in ntpdate 1:4.2.8p10+dfsg-5ubuntu7.

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$