Rudder

They are removed and not replaced, see: http://docs.scala-lang.org/overviews/core/actors-migration-guide.html

And we use it :/ But just in one place, for inventory endpoint.

We need to use something else. Akka is a leviathan, we just want to have a MONOTHREADED async processing queue for inventories => monix should be ok.

It's critical to be able to migrate to scala 2.12.