/etc/logcheck/ignore.d.workstation/gconf is in logcheck-database 1.3.16.
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 | ^\w{3} [ :0-9]{11} [._[:alnum:]-]+ (gconfd )?\([._[:alnum:]-]+-[0-9]+\): starting \(version [.[:alnum:]]+\), pid [0-9]+ user '[[:alnum:]-]+'$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ (gconfd )?\([._[:alnum:]-]+-[0-9]+\): Received signal 15, shutting down cleanly$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ (gconfd )?\([._[:alnum:]-]+-[0-9]+\): Exiting$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ (gconfd )?\([._[:alnum:]-]+-[0-9]+\): Resolved address [^[:space:]]+ to a read-only configuration source at position [^[:space:]]+$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ (gconfd )?\([._[:alnum:]-]+-[0-9]+\): Resolved address [^[:space:]]+ to a writable configuration source at position [^[:space:]]+$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ (gconfd )?\([._[:alnum:]-]+-[0-9]+\): GConf server is not in use, shutting down\.$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ (gconfd )?\([._[:alnum:]-]+-[0-9]+\): SIGHUP received, reloading all databases$
|