As of Shorewall version 2.2.0, this directory is no longer used to
publish updates. See the 'known_problems.txt" file in the download
subvolume for your product version for information about known problems
and corrections.

Example:

Known problems for version 2.2.0 are described in
shorewall/2.2/shorewall-2.2.0/known_problems.txt. Corrected product
components may be found in shorewall/2.2/shorewall-2.2.0/errata/.