If you fix all the bugs that could possibly page you, then, by definition, you will only get paged by things you can't fix ("the network", undersea cable cut, data center explosions, etc).
This phenomenon feels like it needs a name, but I'm not aware of one. Is there one? What would you name it?
If your project appears to be converging towards "no problems except those entirely outside my control" then it's a sign that your project is stable and possibly nearing feature-completion. Maybe convergence is truly asymptotic and you never fully get there, but the bugs and feature changes get smaller and smaller over time.
Not all projects can or should be "stable" in this sense, but it is an interesting indicator.
Then you need to either:
- add more features
- find bugs that "belong" to others, and work on them
- go work from beach
Or maybe all three :)