In the footer of any of the Stack Exchange network site is a "revision ID":

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Is there a change log kept for this somewhere that is publicly available?

The motivation here stems from the fact that network-wide, noticeable (visual or structural) changes are referenced in in FAQ Recent feature changes to Stack Exchange. However, some site-specific changes (in design or otherwise) are not really kept track of unless it's posed as a formal question on the per-site meta.

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