Symptoms

When you open the Orchestration Usage dashboard, some gauges may say 'No Data To Display'.

From the navigation, open Orchestration - Orchestration Usage

Release

Jakarta and later

Cause

This is usually because there literally is no data to display.

If there is a workflow context that included orchestration activities, then each activity will be logged in the 'orch_execution' table. If that table is empty, then none have run yet.
https://<instance>.service-now.com/orch_execution_list.do

That could be confirmed with this list, which queries the workflow context activity history directly:
https://<instance>.service-now.com/wf_history_list.do?sysparm_query=activity.activity_definition.sys_class_name=wf_element_definition

You could further check the count records that provide the data for this dashboard, where Table contains 'orch':
https://<instance>.service-now.com/usageanalytics_count_list.do?sysparm_query=table_nameLIKEorch

Resolution

Once workflows that contain Orchestration activities have been run, you will start to see data displayed.