And more broadly I'm evaluating solutions that are usable without Python. So if there are any key features that are not available through the REST API?

MammothGoat53 , technically speaking all the SDK communicates with the backend via REST API so all reports and actions done by the SDK can be done via REST API. Is there some specific feature you're looking for?

Ah great! I hadn't figured out that adding a metric was an event

Hi MammothGoat53
Do you mean working with RestAPI directly?
https://clear.ml/docs/latest/docs/references/api/events