An hourslong outage on Amazon.com Inc.’s AMZN 2.80% cloud-computing unit Tuesday left Roomba vacuum cleaners dormant, streaming services blank and delayed buyers from snapping up Adele presale concert tickets. Users began reporting issues with Amazon Web Services around 10:45 a.m. EST, according to Downdetector, which tracks website outages. About a half-hour later, the site showed […]