NTP ext script with threshold warning

Hi, 
Although the built-in "ntp" test works great and is simple to implement, is there a Hobbit-compliant external script available that allows ntp to be checked on a number of clients and send an alert if the time is not in sync with the Hobbit server by, say 1 or 2 seconds? 
I've been trying to migrate the BB-centric script bb-ntp-1.5.sh which does this, but I thought I should either write a simpler one for Hobbit or see if there is one already available. 

Thanks,