Staging environment

A staging environment is a copy of production used to verify a release before it reaches users. It runs the same code, on the same kind of infrastructure, with a realistic amount of data.

Its worth is proportional to its similarity to production. A staging server with a different database version, a fraction of the data and none of the integrations will pass changes that fail live, which is worse than having no staging at all, because it grants confidence it has not earned.

It must also be kept out of search results and away from real customer data — a staging copy of a production database is a data protection incident waiting for someone to notice it is reachable.