I'm looking to run a report based on SLA's reached and breached. My Service Desk setup has 4 Priority groups P1, P2, P3, P4) and I would like to know out of all the P1 calls, how many (in percentage terms) have been completed and how many have not. As well for the other 3 priority status' mentioned. I would like to run the same report but for different time frames (such as "calls in the last month, year, week etc.)

I have taken a look at the other posts on this forum and they are all grouped differently(such as by technician or category) but I only want to know  how often the priority's SLA is met/not met.

Many thanks