I had an ex-marine boss leading QA and Prod support. Every time someone would go nuts about incidents being the end of the world, especially our biz users, he'd just ask if anyone was at risk of getting shot. If not, focus up and solve the problem, but no need to run causing extra fuss and stress.
I've used a similar analogy a few times - do we make medical software where someone will literally die if we don't fix this in the next few hours? No? Then chill the hell out and we'll get it fixed without giving ourselves stress related diseases. In a week or a month no one will remember this particular "emergency" but we'll all remember the general level of stress we felt on this team for years.
I've said this out loud a few times. But I've said it quietly to myself far more often when someone is trying to make me feel stressed for no reason. It's very effective.
I like that - I've been at a company where a manager from a mining background would get panicked at a P2 incident, because in the mining industry a P2 incident meant that a person had been physically injured (and would probably be tomorrow's news) but where I was, a P2 meant some but not all revenue-generating systems were experiencing issues.
I think he eventually figured out not to sweat it so much.
had a similar experience early in my career in finance. 35 year old associate (old for the role), ex green beret, always so level, even when dealing with a lunatic VP. asked him why he was cool as the other side of the pillow: "nobody is shooting at me"