As per the documentation:
Cluster CPU Time
Displays a graph of the CPU usage time, in ms, for all nodes in the cluster used by the selected workload.
The graph displays the combined CPU usage time for network processing and data processing. The CPU time for system-defined workloads that are associated to the selected workload, and are using the same nodes for data processing, is also included.
You can use the chart to determine if the workload is a high consumer of the CPU resources on the cluster. You can also use the chart, in combination with the Reads/writes latency chart under the Response Time chart, or the Reads/writes/other chart under the Operations chart, to determine how changes to workload activity over time impact cluster CPU utilization.
If this post resolved your issue, help others by selecting ACCEPT AS SOLUTION or adding a KUDO.