Response times — Late, and who hears about it

Miss a promise and the conversation's chip turns Late, and a Late filter appears beside Needs reply, on exactly the queues that promise a response time and nowhere else. You can also name people to notify on a breach; they are told once per missed promise, not hourly, because an alert that repeats for a fortnight teaches people to ignore the one that matters. Naming nobody is fine: the badge is the whole notification, and that is a legitimate way to run a small desk.