feat: support Unraid storage pools (#7038)

apps/docs/docs/integrations/unraid/index.mdx

@@ -25,6 +25,8 @@ import imgSelectApikeyPreset from "./imgs/unraid-select-api-key-preset.png";
 
 CPU usage is averaged across logical processors, including SMT threads.
 
+Storage includes array data disks and storage pools, including pool-only setups. Pool capacity is shown for the member reporting filesystem statistics; members with missing statistics and zero-size filesystems are omitted. Parity and boot devices are excluded.
+
 ### Adding the integration
 
 <AddingIntegration />