Homelab Hero · No. 009: your result
The rollback might fix it — or the update broke something a snapshot doesn't touch, and the guests arrive to a house where nothing resolves a name. You had a spare Pi and a config backup on the shelf the whole time; this incident was never short of options, only of a decision to use them.
The lesson: Guests in an hour is a restore deadline, not a debugging session.
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Tomorrow’s incident drops with the next issue at 7:00 AM PT.