How do we measure the metric "Percentage Utilization Rate" from Disk IO Metrics - Linux?
https://techdocs.broadcom.com/us/en/ca-enterprise-software/it-operations-management/dx-apm-agents/SaaS/infrastructure-agent/host-monitoring/Host-Monitoring-on-Linux/host-monitoring-metrics-linux/Disk-IO-Metrics---Linux.html
The kernel returns the value when you use the iostat command on your OS. So, it is based on the system reporting the data.
Under Linux it would look like this: