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How has the Facebook outage (October 2021) happened? Could it have been prevented?

Hi dear professionals,

Last week all social media and newspapers have been talking about the Facebook outage (October 4th).  Facebook has issued this update by Santosh Janardhan (VP of Infrastructure).

What exactly has happened there? Are we talking just about a human error? How could it have been prevented?

EB
Evgeny Belenky
Director of Community at PeerSpot (formerly IT Central Station)
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