DX UIM Openshift probe (1.02) collects some storage metrics for Persistent Volume (PV) like:
QOS_OPENSHIFT_PV_STORAGE_CAPACITY
However, it does not collect storage usage, only actual capacity, so not usable for percentage filling.
Enhancement
A Feature exists (F149412) to enhance the probe to deliver consumption metrics for a PV such as storage usage.
As of December 2024 there is no ETA for release of this feature.