"any" worked well (and shows that there are still dns outages that appear to take out all three of their servers, but they're brief and not every day. Good enough for now; this is stable enough that I should clearly
Straight dependencies probably come first, but should keep parallel probing in mind because "don't bother unless" dependencies are a strict constraint on ordering and grouping of parallel tests (though there are also "don't hammer related resources" constriants it will add that a sequential probe doesn't need.