feat: Always stream INP and remove standalone v1 spans#22517
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INP is now always emitted as a v2 web vital span. With span streaming enabled it rides the streaming pipeline; with streaming disabled it overrides the static trace lifecycle for itself and still streams (sent directly via `captureSpan` + `createStreamedSpanEnvelope`, since it is a single span per interaction), because it reports late and would otherwise be dropped. INP was the last user of the standalone v1 span mechanism, so that is removed entirely: the `experimental.standalone` option, the `_isStandaloneSpan` handling and self-send path in `SentrySpan`, the `createSpanEnvelope` wire format, and the `SpanEnvelope`/`SpanItem` types and their exports from `@sentry/core` and `@sentry/types`. Also dedupes the v2 `SpanContainerItem` construction shared by `createStreamedSpanEnvelope` and gen_ai span extraction into `createSpanContainerItem`.
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…e attribute - MIGRATION.md: note the removal of `createSpanEnvelope` and the `SpanEnvelope` / `SpanItem` types from `@sentry/core`. - E2E: assert `browser.web_vital.inp.value` on the INP span (the new payload field) in the react-17 / react-router-6 / react-router-7-spa / react-router-8-spa apps.
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Under the static (transaction) trace lifecycle, force-streaming the INP span made it an ordinary tree span, so it was also swept into the pageload transaction (or emitted as its own transaction when parentless), double-sending INP. Reinstate a per-span standalone flag in core that sends the span on its own as a v2 streamed span and excludes it from transaction assembly. INP sets the flag when span streaming is disabled. Every piece of the mechanism is tagged with a TODO(standalone) marker for removal once the static trace lifecycle is dropped and every span streams on its own.
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INP is now always emitted as a v2 web vital span. With span streaming enabled it rides the streaming pipeline as before. With span streaming disabled (
traceLifecycle: 'static') INP overrides the static lifecycle for itself and still streams, because it reports late and would otherwise be dropped as a late child with nothing to carry it.The bundle size increase is due to the bytes that now have to live in core without being tree-shaken which re-uses some of the stuff gen_ai uses to send out independent v2 spans. It's only a few bytes, the browser bundle savings are more significant.
Note that there is still a bunch of
standalonereferences, those are needed to skip the span from becoming its own transaction in static lifecycles, it can be removed once we drop those in v12.