/etc/logcheck/ignore.d.workstation/dhcpcd 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.
1 2 3 4 5 6 7 | ^\w{3} [ :0-9]{11} [._[:alnum:]-]+ dhcpcd\[[0-9]+\]: eth[0-9]: received SIGTERM, stopping$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ dhcpcd\[[0-9]+\]: eth[0-9]: dhcpcd [.0-9]+ starting$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ dhcpcd\[[0-9]+\]: eth[0-9]: broadcasting for a lease$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ dhcpcd\[[0-9]+\]: eth[0-9]: (acknowledged|offered) (([0-9]|([1-9]|1[0-9]|2[0-4])[0-9]|25[0-5])\.){3}([0-9]|([1-9]|1[0-9]|2[0-4])[0-9]|25[0-5]) from (([0-9]|([1-9]|1[0-9]|2[0-4])[0-9]|25[0-5])\.){3}([0-9]|([1-9]|1[0-9]|2[0-4])[0-9]|25[0-5])$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ dhcpcd\[[0-9]+\]: eth[0-9]: checking (([0-9]|([1-9]|1[0-9]|2[0-4])[0-9]|25[0-5])\.){3}([0-9]|([1-9]|1[0-9]|2[0-4])[0-9]|25[0-5]) is available on attached networks$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ dhcpcd\[[0-9]+\]: eth[0-9]: renewing lease of (([0-9]|([1-9]|1[0-9]|2[0-4])[0-9]|25[0-5])\.){3}([0-9]|([1-9]|1[0-9]|2[0-4])[0-9]|25[0-5])$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ dhcpcd\[[0-9]+\]: eth[0-9]: leased (([0-9]|([1-9]|1[0-9]|2[0-4])[0-9]|25[0-5])\.){3}([0-9]|([1-9]|1[0-9]|2[0-4])[0-9]|25[0-5]) for [0-9]+ seconds$
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