vdostats in node_exporter

[n27051538]

Hello, Does node_exporter provide statistics for VDO (Virtual Data Optimizer)? RedHat recommends to monitor VDO space usage and efficiency using the vdostats utility. Monitoring of physical space on VDO volumes is important to prevent out-of-space situations. Running out of physical blocks might result in losing recently written, unacknowledged data on the VDO volume.