Add warning to BIND relnotes/documentation for 9.19.6 and 9.18.8 and newer - incompatible key files using HMAC-MD5 when upgrading
Summary
There is a surprise problem with old key files when upgrading to a version of BIND that includes feature #3541 (closed). That is, from something older to 9.18.8 or 9.16.34 or newer. Full details of the problem can be found in #3668 (closed). This is a request to add an appropriate warning, somewhere ...
BIND version used
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