ExperimentalProblemDetailsOpenApi
@RequiresOptIn(level = RequiresOptIn.Level.ERROR, message = "This API wraps Ktor's experimental route-description API and may change with it.")
Marks API that depends on Ktor's experimental route-description API.
Such declarations may need a source- or binary-incompatible change when Ktor stabilizes or replaces the underlying API. Opting in accepts that narrower risk without weakening the stability contract of the other problem-details modules.