Is it possible to return the datetime along with the metric data when calling the 2.0 version of your API to advise what time that metric was last updated?
This data is available for reports in the UI.
This seems more like a question than an idea. I'd suggest posting the question in the Adobe Analytics community.
I'll archive this idea for now. If you'd like me to reopen it, feel free to edit the idea and suggest the feature you'd like to be added to the product.