Ask HN: How do solo SaaS founders handle monitoring/PagerDuty?

Can you ever take a break? What if you go on vacation — or simply out for dinner with your friends — and the server goes down? I guess for less complex apps this can be mitigated with something like Heroku, but still... do they hire freelancers to “watch the shop” when they want a break or are they chained to PagerDuty 24/7?