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You are right, I got that wrong, too late to edit now.

Kubernetes was never publicly available (open source) in any other language than Go. Early internal prototypes may have been in Java, but those bear no more resemblance to current Kubernetes than Borg does.

Kubernetes was never Java.

Found the link about its origins.

https://archive.fosdem.org/2019/schedule/event/kubernetesclu...

Yup, watching that talk at last years FOSDEM is what informed me of that part of the history also. Great talk, too!

Unless she's talking about an internal prototype that never saw a public repository, Kris is wrong.

The original prototype that saw a public repo was written by Joe and Craig in Python (mostly Craig IIRC) and lasted for all of about a week before they switched to Go.

The original crew of contributors, all from Google, came from a Java background and definitely wrote Java-flavored Go, but no version of Kubernetes was ever written in Java.

Source: I know all the principals and was a contributing member when Kubernetes was initially released.