I've confusion about the concept of lagging and leading regarding indicators. I know Cycle time is a lagging indicator, it's known when the element is ended. Work item age is leading indicator, you can know how is respect the average of the cycle.
Is it WIP leading indicator similar to work item age?, but Are throughtput and service level expectation lagging indicator as Cycle Time?
There's a good explanation of these within the EBM Guide if you'd like to check that out.
Throughput could fall under a leading / lagging depending on how often you're measuring it and what you're using the data for. If I'm looking backwards to determine my average throughput it becomes a lagging indicator. If I'm looking at my throughput each day it becomes a leading.
I wouldn't have typically thought of an SLE as an indicator in and of itself. Perhaps the ratio in which you meet a given SLE could become leading or lagging.