Stateless Server

Running a stateless server means that all persistent data is stored outside of the server.

Why is it Important?

Stateless servers are easier to deploy/upgrade.
Stateless servers are much easier to recover in case something breaks.
Managing persistent datastores correctly requires significant amount of engineering effort per datastore.
Stateless servers can be scaled independently from their datastore.
Multiple pods of your service can disappear (and lose their non-persistent state) at any time.