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Vanishing power feeds, UPS batteries, failover fails... Cloudflare explains that two-day outage
(www.theregister.com)
This is a most excellent place for technology news and articles.
It was poor design. Poor design caused a 2 day outage. When you've got an H/A control plane designed, deployed in production, running services, and you ARE NOT actively using it for new services let alone porting old services to it, you've got piss poor management with no understanding of risk.