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Logical Volume collector

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This data collector will gather information about the attributes of logical

volumes present in the system.

Its ``kind`` in the report will be ``0`` (`Performance reporting collectors`_).

Its ``category`` field in the report will contain the value ``storage``.

The ``data`` section of the report of this collector will be a list of items,

each representing one logical volume and providing the following fields:

``uuid``

  The UUID of the logical volume.

``name``

  The name of the logical volume.

``attr``

  The attributes of the logical volume.

``major``

  Persistent major number or -1 if not persistent.

``minor``

  Persistent minor number or -1 if not persistent.

``kernel_major``

  Currently assigned major number or -1 if LV is not active.

``kernel_minor``

  Currently assigned minor number or -1 if LV is not active.

``size``

  Size of LV in bytes.

``seg_count``

  Number of segments in LV.

``tags``

  Tags, if any.

``modules``

  Kernel device-mapper modules required for this LV, if any.

``vg_uuid``

  Unique identifier of the volume group.

``vg_name``

  Name of the volume group.

``segtype``

  Type of LV segment.

``seg_start``

  Offset within the LVto the start of the segment in bytes.

``seg_start_pe``

  Offset within the LV to the start of the segment in physical extents.

``seg_size``

  Size of the segment in bytes.

``seg_tags``

  Tags for the segment, if any.

``seg_pe_ranges``

  Ranges of Physical Extents of underlying devices in lvs command line format.

``devices``

  Underlying devices used with starting extent numbers.

``instance``

  The name of the instance this LV is used by.