[atlas] random, but unique ASN probe selection

Hi Marco,

let me plug a project of mine:

   https://ihr.iijlab.net/ihr/en-us/metis/selection

you can enter the number of probes (aka unique ASes) you want to use in the form
and then click on "Go". At the bottom of the page you will then find a JSON
snippet which replaces the "probes" field of the API spec provided by the
Atlas webinterface.

This selection tries to prioritize ASes that are "far apart" from each other
according to the distance metric in the form, so the order is not randomized,
but depending on what you want to achieve might be random enough.

If you want to do multiple iterations with a randomized AS set each time, I
guess you will have to build this yourselfes. However, you could enter 4000 for
the number of probes and the API spec will contain fields for all ASes with
connected Atlas probes, which you could use as a starting point.

Also note that you might not get the exact number of probes requested, since
some ASes only have one probe and if it's overloaded it won't participate.

Best,
Malte
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