The new disk meter reading correspond to libvirt domblkinfo Statistics :
capacity, allocation and physical(usage) .
Storage meters per instance
disk.capacity = Disk Capacity for all the disks of the instance
disk.usage = Disk Usage for all the disks of the instance
disk.allocation = Disk Allocation for all the disks of the instance
Storage Meters per disk per instance
disk.device.capacity = Disk Capacity for each individual disk of an instance
disk.device.usage = Disk Usage for each individual disk of an instance
disk.device.allocation =Disk Allocation for each individual disk of an instance
DocImpact
Implements: blueprint disk-info-meters
Change-Id: Ie5accb8fb75b0d3a6641d090fa273fc8fe100ab3
707c286cf5