/etc/logcheck/ignore.d.server/rsnapshot is in logcheck-database 1.3.17.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | ^\w{3} [ :0-9]{11} [._[:alnum:]-]+ rsnapshot\[[0-9]+\]: /usr/bin/rsnapshot( -c [^ ]*)? (hourly|semidaily|daily|weekly|monthly): completed successfully$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ rsnapshot\[[0-9]+\]: WARNING: /usr/bin/rsnapshot: (hourly|semidaily|daily|weekly|monthly): completed, but with some warnings$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ rsnapshot\[[0-9]+\]: WARNING: Some files and/or directories in root@[._[:alnum:]:/-]+ vanished during rsync operation$
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