We have an SLA set for first response, which works perfectly.
I'd like to track the responsiveness of the team on subsequent responses. For example
Ticket is raised with a bug, team review it and respond to the customer within 2 hours to confirm it is a bug and they will replicate the issue. A day later the customer hasn't had an update and adds a comment requesting an ETA. I want to be able to track the time it takes for that response (and any subsequent responses to customer comments on the same ticket).
We're currently on server but moving to cloud in the next year.