That"s why the new method of using DNS
to cache the version number will be a much better solution and I think
it will allow more frequent checks without burdening the mirrors and
shifting the load to the DNS infrastructure.

I am not a DNS expert by any means and I may be way off in left field here but you may want consider that there are many a server behind gateway appliances or proxies that cache DNS for a fixed length of time. I really have no idea if there are devices that do not obey refresh values but the bigger question is: do you? Without knowing for sure how these devices handle the DNS refresh I would be cautious. It may not be an issue if the server were configured to use a real a DNS server to obtain records, but I would think many internal servers are configured to obtain records from gateway proxies/routers/appliances and if configured to do so, and these devices do not obey rules, the records they see may be 12 hours old or older.

Just something to consider. I could be wrong.

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