Agile Team Velocity
Target as % of average story points that team completes for period that includes multiple sprints.
Improve by % vs. period
Set & track target as % of improvement of certain metric vs past period.
Performance based on complexity
Understand on average time of delivering Stories with certain complexity and evaluate their estimation accuracy.
Time between events
Track average time spent between any combination of events and break it down to understand more details regarding WIP distribution. e.g. Set target as % of average time from Start Progress to Resolve for operations critical issue.