Values.GroupsSourceval to_value :
Group.t list ->
[> `List of
[> `Structure of
(string
* [> `List of [> `String of Key.t ] list
| `Map of
([> `String of MetricName.t ]
* [> `Structure of
(string * [> `String of MetricAmount.t ]) list ])
list ])
list ]
list ]