OpenMediaVault integration just received new update, be sure to check it out.
New features
Added support for KVM plugin, including VM power control and snapshot
Added support for Compose plugin
Added integration options: Scan interval, disable S.M.A.R.T.
Added network sensors
Implemented reboot and shutdown service
Implemented HA auto conversion
Attributes now use snake case
Added more disk attributes
Added more filesystem attributes
Changed filesystem entity name from mountpoint to device name
Changed service entity name to reflect OMV UI
Updated uptime sensor to HA standard
Updated update sensor to reflect OMV API change
FIXES
Fixed possible API timeout
Fixed temperature for NVME devices
Removed bcache devices from S.M.A.R.T. queries