Grafana internal metrics documentation

Is there a place documenting the meaning of grafana internal metrics, in particular I’m looking for info about api.dataproxy.request.all

no, there is no docs for this currently.

think that means all types of proxied data source requests (GET/POST/etc).

By “proxied data source requests” do you mean requests to data source made from the Grafana backend (as opposed to requests to data sources made from the client)?

yes, all requests to data sources configured to use the “proxy” access setting.