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Its a load balancer bug. Thats it. Everything else functioned totally normally from what I can see. I think people are blowing this out of proportion saying everything is so complex or its all microservices oh no!

This exact bug could have bit a large monolithic app running on a VM.

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No, its not a load balancer bug. It was a bug with the home built program they built for managing config load ins TO the load balancer. The load balancer did exactly what it was instructed to do--but the slack developed app for helping the load balancer deal with their overly complicated back end discovery problems failed to keep the load balancers updated with accurate information on backend servers available for serving.

My sentiments exactly.

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