A tap in the page sends no span of its own #376
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Found reviewing what production's traces and metrics leave out, 2026-10-25. A trace begun in the page has no root span: its API calls are there side by side, but not how long the tap took to show its result. Wanted: the page reporting its tap as a span, the root of the trace its requests join.
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dd91602: the page puts a root span id in each request's traceparent and reports the tap (ids, start, last answer) when the next begins or it is hidden; ipx builds the span with those ids through an id generator on the shared tracer provider (opentelemetry 0.33's span builder takes none). A test tap showed in Tempo as the root with its request under it. Deployed 2026-10-25.