[reegnz]

unikernel is not the same as microkernel.

I've found these after some quick googling:

https://unikraft.org/ https://hermitcore.org/ https://nanos.org/

Seems to be a living concept still, just not in the mainstream.

[flaminHotSpeedo]

There are mainstream use cases, particularly for cloud providers who want lightweight runtimes with hypervisor managed isolation.

The only "example" I can think of off hand is Firecracker, but I'm not 100% confident that Firecracker is technically a unikernels.

My guess is that there's a number of unikernel implementations behind closed doors that see heavy use