Nudges, private to one person
You can now nudge someone about a ticket, a planned ticket, a cost or a quote, pointing them at it without writing a comment. Pick the people who should see it and say what you are asking for, whether that is their input, a review, that you are blocked on them, or simply that they should know.
A nudge leaves nothing on the ticket: no comment and no timeline entry, and nobody else can see that it happened. It reaches only the people you picked, in their inbox and on their phone, and by email if they have asked for that. Open it from the card menu, beside Watch and Set reminder.