Term Kind Topic What it is
Contention Blind Spot Single-User Environment Blindness, Concurrency Fidelity Gap concept Developer Environments The class of defects a one-user test environment cannot exhibit at all - lock waits, pool exhaustion, races and plan flips - because they require concurrency and production-shaped data rather than correct code.
Developer Environment on Demand Ephemeral Environment, Preview Environment pattern Developer Environments A full running instance of the system created automatically per branch or pull request and destroyed when it merges.
Ephemeral Environment pattern Developer Environments A full environment created on demand for one change and destroyed afterwards, which removes the queue for shared environments and the drift within them.