You need to build a stateless fish tank via replicas. It's pretty common that a new feature gets introduced into the upstream. You never even see it until one of your tanks crashes. That's why it's critical to have a backup strategy, n+1 redundancy, and a robust change control process to limit contagion risk.
I used to have a roommate that had like 12 tanks going all the time. I couldn't even complain, because I hosted my own kubernetes cluster, so I understood exactly why he needed them.