The original issuse for feature federated pod autoscaler is here, and the feature is being tracked here. This issue is to track and follow up pending items from the first phase of implementation especially items chosen to defer in the first phase of implementation here.

1 - Make the replica nums offered (both min and max) and in turn increased or reduced from an existing cluster local hpa, configurable. Right now the value is kept to a pessimistic low of 1 at a time.
2 - Optimise the algorithm such that if there are clusters which need the replicas, they can first be taken from those clusters that have capacity to offer more.
3 - Implement hard limit based min/max preferences per cluster from the user.
4 - Contemplate usage of weighted distribution of replicas based on the weights applied on per cluster hpas by the user.