Glossary terms - E

Terms beginning with E cover the places code runs and how it is reached — environments, ephemeral preview environments, the edge and egress traffic. Every definition is short and citable.

2 terms

Delivery pipelines
Environment promotion
Environment promotion moves a single built artifact through a chain of runtime environments - typically dev, staging and production - running the same tests and health checks at each stop. The artifact is not rebuilt between environments; only its target changes, so what you tested is exactly what ships.
Delivery metrics
Error budget
An error budget is the amount of unreliability a service is allowed over a fixed window: the gap between its target reliability (SLO) and 100%. Teams spend that budget on new releases and risky changes; when it runs out, they pause launches and prioritize stability until the window refills.