We can't give you a clear answer to this. It depends on the app you are adding.
Some apps are small, you won't even notice that they've been added (in terms of memory or performance). Some apps will trip your Jira from "takes a while to start" to "fails before starting because it is out of memory"
It is a complex process, there is no app we can put a simple number on. I mean like "if you add app X, then you will want to increase your heap size by Y.
Your assumption that each app consumes more memory is entirely right, all apps are loaded during startup, and the more there are, the more memory gets used. But it's an app-by-app basis, there's no way to guess how each app might affect your particular system.
Focus on the monitoring, not the apps.
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