I had the same question and I just find differents commands to help us.
1- To know the current throughput used for the last 5secs, 1 min, 5min and 60 min :
show platform hardware qfp active datapath utilization sum
2- To know the throughput configured
sh platform hardware throughput level
3- To know the throughput monitor configuration :
show platform hardware throughput-monitor parameters
4- To know the drop statistics
show platform hardware qfp active statistics drop clear
5- To Configure monitor to send an alert on a syslog if thershold is reached.
set platform hardware throughput-monitor threshold 80 interval 60