Not very useful with nfs-subdir-external-provisioner

[Kuerten]

One of the main pitfalls of nfs-subdir-external-provisioner is that it does not really separate different persistent volumes.
Node exporter then only gives stats for the whole filesystem.

This does not provide volume level metrics either, it just provides the same (volume) data as node-exporter does.
While this does indeed allow us to monitor the nfs file system without deploying node-exporter, it does not help at all with detecting a particular pvs usage.
While this arguably helps in some use cases if does certainly not "fill the [entire] vacuum".