Bug#916055: (no subject)

[Andre Heider]

I ran into the same issue and came with another approach. The patch was 
just merged upstream[0], so post v0.17.0.

That also introduces a new metric if a disk is in standby mode.
Could you please update to 0.17.0 and cherry-pick that instead?

Thanks!
Andre

[0] 
https://github.com/prometheus/node_exporter/commit/7c960fd68365e9bbdb14cf140fc1d26d4c27333a.patch