Metric storage
By default we ship all metrics to RRD files, either directly or via RRDCached. On top of this you can ship metrics to Graphite, InfluxDB (v1 or v2 API), OpenTSDB or Prometheus. At present you can't use these backends to display graphs within LibreNMS and will need to use something like Grafana.
For further information on configuring LibreNMS to ship data to one of the other backends then please see the documentation below.