Discreet cydia tweak will determine whether one has pending notifications or not and vibrate to notify.
Discreet is perfect if you need to check if someone texted you and you need to know without pulling your phone out (such as with friends or in a meeting).
Best to apply to lockscreen only and to a physical button (so its press-able in one’s pocket!)
Big thanks to Max Katzmann for help some insights on this tweak.
Configure Activator from Settings.