On TrueNAS Scale, you can export performance related metrics to an external metrics store to be graphed in Grafana. Surprisingly there are no pool or VDEV usage metrics! I wrote https://mktbs.net/blog/2024/05/21/truenas-scale-pool-metrics to detail a fairly simple way to grab pool and VDEV metrics into InfluxDB and Grafana using a local script to scrape df and send through InfluxDB. #homelab