I'm using node-red-contrib-telegrambot. Is it possible to send a message marked as read so that there's no unread notification? I already have that group muted but some of the messages are more for logging purposed than anything else.
I don't think so - the client marks things as read. There generally wouldn't be much call for a server process to be able to do that as it could cause all manner of other confusion. I generally have a couple of bots running for my home automation setup. One has minimal outputs and allows queries and controls to be sent back - this is the family friendly one. The other is very "chatty" and lets me see what is going on behind the scenes. I just leave that muted.
It was mostly to reduce the unread count on my desktop telegram to minimize distraction.