what does this mean in suricata rule alert?

Question

I installed and configured suricata to give errors. It gave me error like

Jan 13 11:22:18 201612317 01/13/2017-11:22:18.308560 [ ] [1:2001219:20] ET SCAN Potential SSH Scan [ ] [Classification: Attempted Information Leak] [Priority: 2] {TCP}

I wanted to know what does this [1:2001219:20] mean in this rules ?

Answer 1

I found the answer. It is

1 is the classtype

2001219 is the alert id

20 is the revision