If each of the criteria is a limited set, I'd just evaluate each value then add them up.
index=ticket_data
| eval Resolved=if(current_ticket_state=="Resolved",1,0)
| eval Unresolved=if(current_ticket_state=="Unresolved",1,0)
| eval System_gen=if(system_user=="BI Admin",1,0)
| eval User_gen=if(system_user=="User",1,0)
| stats sum(Unresolved) as Unresolved sum(Resolved) as Resolved sum(System_gen) as "System Generated"
sum(User_gen) as "User Generated" by owner_name
| rename owner_name as "Assigned To"
... View more