Ions cast/metric confusion says that the keys of the argument map are :name, :value, and :type, but the example has :units instead of :type. Which is it?

Also for :name, the docs say it should be a keyword. What if it is a namespaced keyword? Are there limitations on the length of that keyword?

The example is correct, the key should be :units

AWS metrics ignore namespaces, so :Mymetrics/My-metric-1 will result in a metric called My-metric-1.

I will update the documentation to include these details.