/etc/logcheck/ignore.d.server/libapache2-mod-shib2 is in libapache2-mod-shib2 2.6.0+dfsg1-4+deb9u1.
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 | ^\w{3} [ :0-9]{11} [._[:alnum:]-]+ shibboleth-sp: [0-9]+ INFO Shibboleth\.Config : shibboleth [0-9.]+ library (shutting down|shutdown complete)$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ shibboleth-sp: [0-9]+ INFO Shibboleth.SessionCache : cleanup thread exiting$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ shibboleth-sp: [0-9]+ INFO XMLTooling.XMLToolingConfig : xmltooling [0-9.]+ library shutdown complete$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ shibboleth-sp: [0-9]+ INFO Shibboleth\.Config : building ListenerService of type UnixListener\.\.\.$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ shibboleth-sp: [0-9]+ INFO Shibboleth\.Config : building RequestMapper of type Native\.\.\.$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ shibboleth-sp: [0-9]+ INFO Shibboleth\.Config : building SessionCache of type StorageService\.\.\.$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ shibboleth-sp: [0-9]+ INFO Shibboleth\.SessionCache : cleanup thread started\.\.\.run every [0-9]+ secs; timeout after [0-9]+ secs$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ shibboleth-sp: [0-9]+ INFO Shibboleth.SessionCache : purging [0-9]+ old sessions$
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