A ticket reopened, or a new ticket in the same category within a stated window of a closed one, per account. The account-level repeat rate against the team's base finds the customers for whom the average first-contact-resolution figure is not true.
Per agent is coaching. Per account is retention.
Repeats clustered in one category across many accounts is a product finding with an account list attached.
Tickets reopened, or raised in the same category within a stated window of a closed ticket on the same account, divided by tickets.
An account raised six tickets, of which three were repeats: 50 percent against a team base of 19. All three were in integrations.
Closed tickets counted as resolved. The customer came back, and the second ticket was counted as new work.