You learn pretty quick. Like CPU I don’t alert on it, I do on load average which is more realistic. I’m also solo dev, so I do it on the 15min avg and it need to be above a pretty high threshold 3 times in a row. I don’t monitor ram usage, but swap instead. When it trigger it usually something need to be fixed.

Also check for a monitoring solution with quorum, that way you don’t get bothered by false positives because of a peering issue between your monitoring location and your app (which you have no control over).