Engineering Large Systems When You're Not Google Or Facebook by Charity Majors

Like it or not, you already test in production.

It’s impossible to make staging an exact mirror of production. Spending obsessive energy trying to do it does not make it less impossible.

Like it or not, you already test in production… but you probably haven’t invested enough in tooling, so you think you should have tested more in staging. Let’s talk about what to test with CI, and how to channel your energy on profitable improvements to your prod-testing pipeline. Instead of falling back, let’s talk about how to own testing in production.