Do remember that BROKEN and FORBIDDEN are to be used as a temporary resort if a port is not working. Permanently broken ports should be removed from the tree entirely.
When it makes sense to do so, users can be warned about a pending port removal with DEPRECATED and EXPIRATION_DATE. The former is simply a string stating why the port is scheduled for removal; the latter is a string in ISO 8601 format (YYYY-MM-DD). Both will be shown to the user.
It is possible to set DEPRECATED without an EXPIRATION_DATE (for instance, recommending a newer version of the port), but the converse does not make any sense.
There is no set policy on how much notice to give. Current practice seems to be one month for security-related issues and two months for build issues. This also gives any interested committers a little time to fix the problems.
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