Design replacement buckets

[johscheuer]

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What would you like to be added/changed?

I have this idea for a long time and I will try to find some time in the next weeks to write a proper design about this. I think we should implement some king of replacement buckets. The idea would be to look at each process class independently, in our current implementation a slow replacement of a single storage process can block any further automatic replacement, instead it would make sense to look at the process class and limit the replacements based on the process class with perhaps an additional upper limit.