Niels de Vos 2b9c81b87d Add helper functions for Block volume Capacity detection ...

Similar to how NewMetricsStatFS() works, the new NewMetricsBlock()
provides the GetMetrics() interface for Block volumes.

Additional metrics for Block volumes are difficult to gather. There is
no guarantee that there is a filesystem on the volume, which makes most
of the volume metrics useless.

Advanced storage might be able to detect the actual consumption (when
thin-provisioned) vs the capacity. However, this is out of the scope for
a standard helper function and requires intimate knowledge of the used
storage system.

2021-05-20 16:37:12 +02:00

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