This file is indexed.

/etc/logcheck/ignore.d.server/stunnel 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.

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^\w{3} [ :0-9]{11} [._[:alnum:]-]+ stunnel(\[[0-9]+\])?: SSL_read .*: Connection reset by peer$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ stunnel(\[[0-9]+\])?: .* connected from .*$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ stunnel(\[[0-9]+\])?: VERIFY OK: depth=[0-9]+, .*$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ stunnel(\[[0-9]+\])?: Received signal 15; terminating$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ stunnel(\[[0-9]+\])?: stunnel [0-9.]+ on i386-pc-linux-gnu PTHREAD\+POLL\+IPv6\+LIBWRAP with OpenSSL [0-9a-z.]+ [0-9]{2} \w{3} [0-9]{4}$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ stunnel(\[[0-9]+\])?: [0-9]+ clients allowed$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ stunnel(\[[0-9]+\])?: SSL_accept: Peer suddenly disconnected$