alt Hacker Newsload balancer failure? rate limit woudl address concurrency limits? throttle or queue up messages. auto-scale failed cause was misconfiguration policy, which i admit cannot be handled by my suggestions. The cascade? it's downstream service degradation, which I mentione should have had been prevented with queues. One of the jobs that queues/kafka solve is to prevent these downstream outages.
If your LB is down, you're just kind of screwed. You can't enqueue things if requests aren't getting through at all. Same deal with authn/authz issues, which they also had. If you can't answer the question "is this message allowed to be added to the queue" you can't enqueue stuff.
GitHub does use queueing for all kinds of stuff internally, though, because they're not morons.