! akka-cluster: metrics collector improvements - resolve #16121

that ticket is now closed without action: #10503

I understand the intent of backoff, but I don't think we should be too fancy here. A OneForOneStrategy should be enough to cover flaky exceptions, but stop it when it goes crazy.

If we really want backoff then it can be implemented with a stopping strategy and start the child again. Illustrated here: https://github.com/akka/akka/blob/master/akka-contrib/src/main/scala/akka/contrib/pattern/ClusterSharding.scala#L1238