Where can i find detail information of all the metrics and concept in the Nsight Compute?

For example, sm_inst_executed.avg.per_cycle_elapsed, what’s executed instruction?What’s the formula to calculate the average of executed instruction? what’s the elapsed cycle on sm? How is it counted?
what’s the maximum value of this metrics in ideal situation?
what about sm_instruction_throughput.avg.pct_of_peak_sustained_active?

The documentation of Nsight Compute seems not to contain all these information.

The best source for this type of information is the kernel profiling guide. There is a metrics reference section Kernel Profiling Guide :: Nsight Compute Documentation