Cloudflare Postmortem:<p><a href="https://blog.cloudflare.com/post-mortem-on-cloudflare-control-plane-and-analytics-outage/" rel="nofollow noreferrer">https://blog.cloudflare.com/post-mortem-on-cloudflare-contro...</a><p>"On November 2 at 08:50 UTC Portland General Electric (PGE), the utility company that services PDX-04, had an unplanned maintenance event affecting one of their independent power feeds into the building. That event shut down one feed into PDX-04. The data center has multiple feeds with some level of independence that can power the facility. However, Flexential powered up their generators to effectively supplement the feed that was down.<p>Counter to best practices, Flexential did not inform Cloudflare that they had failed over to generator power. None of our observability tools were able to detect that the source of power had changed. Had they informed us, we would have stood up a team to monitor the facility closely and move control plane services that were dependent on that facility out while it was degraded.<p>It is also unusual that Flexential ran both the one remaining utility feed and the generators at the same time. It is not unusual for utilities to ask data centers to drop off the grid when power demands are high and run exclusively on generators. Flexential operates 10 generators, inclusive of redundant units, capable of supporting the facility at full load. It would also have been possible for Flexential to run the facility only from the remaining utility feed. We haven't gotten a clear answer why they ran utility power and generator power."