/etc/logcheck/ignore.d.server/ninja is in ninja 0.1.3-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | ^\[\w{3} \w{3} [ :0-9]{16}\] ninja version [0-9.]+ initializing$
^\[\w{3} \w{3} [ :0-9]{16}\] magic group: gid=0 \(root\)$
^\[\w{3} \w{3} [ :0-9]{16}\] logfile: /var/log/ninja.log$
^\[\w{3} \w{3} [ :0-9]{16}\] whitelist mapped in memory at 0x[0-9a-f]+$
^\[\w{3} \w{3} [ :0-9]{16}\] entering daemon mode$
^\[\w{3} \w{3} [ :0-9]{16}\] entering main loop$
^\[\w{3} \w{3} [ :0-9]{16}\] generating initial pid array..$
^\[\w{3} \w{3} [ :0-9]{16}\] now monitoring process activity$
^\[\w{3} \w{3} [ :0-9]{16}\] ignored signal: (15|18)$
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