/etc/logcheck/ignore.d.server/dhclient is in logcheck-database 1.3.17.
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 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 | ^\w{3} [ :0-9]{11} [._[:alnum:]-]+ dhclient(-2.2.x)?: Internet (Software|Systems) Consortium DHCP Client [.[:alnum:]-]+$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ dhclient(-2.2.x)?: Copyright [-0-9]+ Internet Systems Consortium\.$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ dhclient(-2.2.x)?: All rights reserved\.$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ dhclient(-2.2.x)?: For info, please visit http(://www\.isc\.org/(products/DHCP|sw/dhcp/)|s://www\.isc\.org/software/dhcp/)$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ dhclient(-2.2.x)?: There is already a pid file /var/run/dhclient\.[[:alnum:]]+\.pid with pid [[:digit:]]+$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ dhclient(-2.2.x)?: killed old client process, removed PID file$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ dhclient(-2.2.x)?:$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ dhclient(-2.2.x)?: Listening on [^[:space:].]+$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ dhclient(-2.2.x)?: Sending on[[:space:]]+[^[:space:]]+$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ dhclient(-2.2.x)?: DHCPDISCOVER on [[:alnum:].-]+ to [.0-9]{7,15} port 67 interval [0-9]+$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ dhclient(-2.2.x)?: DHCP(NAK|ACK|OFFER) (of [.0-9]{7,15} )?from [.0-9]{7,15}$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ dhclient(-2.2.x)?: DHCP(REQUEST|RELEASE) (of [.0-9]{7,15} )?on [[:alnum:].-]+ to [.0-9]{7,15} port 67$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ dhclient(-2.2.x)?: bound(:| to [.0-9]{7,15} --) renewal in [0-9]+ seconds\.$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ dhclient(-2.2.x)?: [[:lower:]]+[0-9]: unknown hardware address type [0-9]+$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ dhclient(-2.2.x)?: Trying recorded lease [.0-9]{7,15}$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ dhclient(-2.2.x)?: No working leases in persistent database( - sleeping)?\.$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ dhclient(-2.2.x)?: send_packet: Network is unreachable$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ dhclient(-2.2.x)?: send_packet: please consult README file regarding broadcast address\.$
# dhcp-client 2.0
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ dhclient(-2.2.x)?: Copyright (199[5-9],? ){5}(The )?Internet Software Consortium\.$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ dhclient(-2.2.x)?: Please contribute if you find this software useful\.$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ dhclient(-2.2.x)?: For info, please visit http://www.isc.org/dhcp-contrib.html$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ dhclient(-2.2.x)?: No DHCPOFFERS received\.$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ dhclient(-2.2.x)?: Sleeping\.$
# 3.0
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ dhclient: parse_option_buffer: option [-[:alnum:]]+ \([[:digit:]]+\) larger than buffer\.$
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