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Your comment doesn't really help understand why.

GitHub experiences outages pretty regularly, for example on 12 separate days last month: https://www.githubstatus.com/history

So what? Nothing here is sufficient to conclude it has anything to do with k8 whatsoever.

For example “users cannot resume code spaces created before the incident” sounds a lot more like an application level problem.

The point above was that it wasn't a good endorsement. Correlation is not causation but the opposite is also true.