As per the dev summit: https://docs.google.com/document/d/1iO1QHRyABaIpc6xXB1oqu91jYL1QQibEpvQqXfQF-WA
CONSENSUS: We want to explore remote write in Prometheus as an EXPERIMENTAL feature behind a feature flag. We will explore this without restricting possible approaches. We will do this in a design doc at first.
This is the design document: https://docs.google.com/document/d/1PpTDtVaKAnhMRxBJ0k7_rCQ3Z3uJVcALgdPo0QpObSk
Also see #4769