/etc/logcheck/ignore.d.server/slapd is in logcheck-database 1.3.18.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | ^\w{3} [ :0-9]{11} [._[:alnum:]-]+ slapd\[[0-9]+\]: OTP unavailable because can't read/write key database /etc/opiekeys: No such file or directory$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ slapcat: bdb_db_init: Initializing BDB database$
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