What I said (GCP runs on Borg) is absolutely and technically correct, affirmed by your own comment, which highlights the power and flexibility of Borg. The point being no one[1] at Google relies on Kubernetes for raw cluster management capabilities at scale. They might use it for other things that can make deployment more friendly in some scenarios. (This doesn’t make Kubernetes a bad system by any means, just quite different and not a substitute for Borg whereas gRPC is a direct substitute for Stubby). This debate is better argued in your own eng-misc@ and not on a public forum.

[1]: no-one that we care. At Google this is obviously always incorrect. There’s always that someone who uses weird things like mongoDB and AWS.