Metric for agents who have solved 0 tickets

Hi,

I would want to have a report on the number of agents who have 0 tickets either assigned or solved in their name. The reasons I would want this report is because we want to make sure our agents are using their support licenses correctly and actually providing support. I understand that solved tickets/assignee name and a date filter could help find this but in the case where agents sign in and do not take tickets at all. I think that would be interesting to find out to help optimize our support licenses. I also understand that there is a agent replies bracket attribute but that would not fit our needs either as agents can solve tickets without responding to a ticket. 

Kind Regards,

Darren