How can I get information on the various Upsun regions?

For example, which ones are available, where are they, what IaaS infrastructure do they run on?

You can use the Upsun API: 

upsun api:curl regions | jq '.regions[] | select(.available)  | .id + ": " + .provider.name + " - " + .zone + " - " + .timezone' | sort

Or, for example you can use the following command to list out the regions and their carbon intensity: 

upsun api:curl regions | jq -r '.regions[] | select(.available != false) | "\(.label): \(.environmental_impact.carbon_intensity)"'

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