Package: isc-dhcp-client Version: 4.4.3-P1-1 In the package Description mention something about End Of Life. Yes, it's mentioned in /usr/share/doc/isc-dhcp-client, but it should also be mentioned in the package Description section, so e.g.,
$ apt show isc-dhcp-client ... Priority: important ... Description: .... will warn potential users that all is not sunny.
