Intrusion Detection System log analysis with Suricata => Lab Section 4.Setup Question 4.4

Course: Intrusion Detection System log analysis with Suricata
Version: 4.Setup
Question: 4.4 "How many total alerts were generated for the test signature?"

Hello,
At that moment in the training, there is no test signature anywhere ! following the video we just ran suricata with particular arguments, but no signature were used anywhere ...
I thought "maybe its zero ?" => no
I thought "maybe its the total number of packets ?" => no

I really do not understand this question at that moment on the training. May someone clarify this please ?

Thanks a lot

Regards,