Is disk saturation monitored?
Yes. Prometheus fires KubePersistentVolumeFillingUp alerts when any PVC (database disk) is filling up — both a current-fill alert and a predictive alert based on fill rate. The Deploy team is paged via PagerDuty. Response SLA is within 1 hour.
Inode exhaustion is monitored separately (KubePersistentVolumeInodesFillingUp).