"successful writes since start" has a time value associated with it, right? I think what you want is not to correlate "time since start" and "successful writes

"successful writes since start" has a time value associated with it, right? I think what you want is not to correlate "time since start" and "successful writes since start", but to just do a derivative of the "successful writes since start" metric. This is just like the networking stats on Linux hosts. I have something like: FROM default net WHERE host =~ /$Host$/ SELECT field(bytes_recv) mean() derivative(1s) alias(In) GROUP BY time($interval) tag(host) tag(interface) fill(null) FORMAT AS Time series ALIAS BY [[col]] [[tag_host]]/[[tag_interface]] That's in my Grafana query. Aside: I sent the TimeseriesDB reference to a friend that just a couple days ago asked about options for storing metrics on storage servers. I had told him about my experiences with Influx, had mentioned Prometheus and also Sentry has some sort of internal TSDB they do on Postgres. In reply to the TimeseriesDB reference, he replied that he was all about InfluxDB now.