Kubernetes is an application that manages virtual machine configurations. While it's a system in the sense of a collection of parts that work together, it is not a system in the sense of the original meaning of systems programming.

That tended to mean a language designed to compile down to processor instruction sets the way C, C++, or now, Rust do.

Go was intended to replace C++ and C for many of the things that Google programmers did, but it wasn't intended to aim at "bare metal" if I recall Rob Pike's design talks correctly.