In theory, wherever Akka is used Parapet can be used instead. It's just not that big as Akka. Parapet provides a messaging module for interprocess communication based on ZMQ.
as I can see Metaparticle is a tool specifically built for Kubernetes and uses its API underhood. Parapet can be extended to support Kubernetes ecosystem how it was done for ZMQ. Parapet can be integrated with Metaparticle, so that you can run the same distributed algorithms written in Patapet in a Kubernetes cluster.