There was a failure recently at an Azure data center in Australia when a utility power sag caused equipment to trip offline at one of the Azure data centers in Australia. You can read about it here, but essentially the headline is that there were only three people on site when the incident occurred, and that caused them to be unable to restart the equipment in time.

In a little more detail, there weren't enough people to quickly restart the equipment chillers after the incident. The staff had to access the equipment on a roof when 13 of the units didn't restart. They were able to get to 8, but when they got to the last 5, the temperature of the water had risen to a level that wouldn't allow a restart. So they had to power down some computer equipment and go through a more lengthy process to get everything running.

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