SellerHintChangelog
What changed, and when
Release notes per product and channel. Nothing is backfilled: a release appears here only when it has actually shipped.
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When a release ships, its entry will list what was added, improved, fixed, changed, deprecated and removed, along with known issues, the minimum system version, and any migration or backup advice.
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Both feeds are generated at build time from the same entries shown here.
How security fixes are described
A release that fixes a security issue says so, and states which versions are affected and what you should do. Exploit detail is not published, and specifics are withheld until users have had a reasonable opportunity to update.