Ticket ratings
Ask the opener to rate the support after a ticket closes, and see the scores per staff member.
How it works
Turn on rating_enabled in the ticket settings and pick a rating_channel. When a ticket closes, the opener receives a DM: "Rate ticket <name>. How was the support in <server>?" with five buttons, 1/5 to 5/5. Pressing one records the score once; the buttons then stop accepting input.
Where the score goes
The rating is posted to the rating channel with the score as a bar, the ticket name, the panel it came from and who rated. Ticket Analytics shows the average rating for the period next to the Most Active Staff table, which counts claims and closes per staff member.
When no rating arrives
The DM cannot be delivered if the opener has DMs from server members off, and a rating only counts if it was pressed. Expect a fraction of tickets to be rated; compare staff on the same period rather than absolute counts.
Ratings are about support tickets. Product reviews with a star rating are the separate Reviews module.