How about another Prometheus server in federation[0]? It's as simple as another Prom instance pointing at the "live" Prom instance. You can filter only the met

How about another Prometheus server in federation[0]? It's as simple as another Prom instance pointing at the "live" Prom instance. You can filter only the metrics you want to keep for a long amount of time, and downsample if necessary (by just setting a higher scrape interval on the "long term" Prom). Since this "long term" Prom isn't in the critical path you could skimp on processing resources and just give it a big disk as a cost optimization. If you are on AWS (or equivalent) the storage there is pretty durable. On-prem you can run HA (two instances with identical config). [0] https://prometheus.io/docs/prometheus/latest/federation/ https://prometheus.io/docs/prometheus/latest/federation/