This is not a full review. I'm late to this and I apologize if I'm covering ground which has been fully resolved before. With all hats off...
It has come up in the working group before that some of the cost metrics can vary quite a lot over time, much more quickly than the scale at which ALTO would update them. Have we considered changing the metrics to have more long-lived properties while still being useful? For example 1. we could split the various delay metrics into min and max versions. Min and Max delay should be relatively constant over a given topology. Max delay maps quite nicely to something like an SLA. 2. packet loss -- can we focus this on link layer losses rather than queue drops? Most simply, this could just be a boolean that says "this path frequently has losses not related to congestion" but could also be expanded into a link packet error rate, if valuable. Congestion based losses are of course dependent on the application. Thanks Martin
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