I've been discussing, in this issue, at Dynatrace OpenTelemetry metrics for JS GitHub repository about the some future support for some of the feature now the deprecated repository covered. And I was instructed to seek for further details here in the community.
Thanks
Best Regards
Gustavo Kath
Hey Gustavo,
I cannot answer the first question as I understand OpenTelemetry is still a work-in-progress.
As for your second question, I think you can assume that any extra custom metrics that you create with Dynatrace Extensions is going to come at a cost (DDUs). I'm assuming you're are referring to the OneAgent Metrics API?
I believe that there is still a cost associated to custom metric ingestion via that OneAgent Metric API but I don't know for certain.