Introduce routing metadata as a span property#11
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Spans gain an optional routing property, set at construction and inherited by children. `RoutingMetadata` is a trait — `group_key` (groups spans for batching) and `encode` (produces the wire value) — so consumers define their own routing type; spans store it as `Option<Arc<dyn RoutingMetadata>>`.
TheJokr
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Jul 13, 2026
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Introduces RoutingMetadata as a span property describing where a span's data should be routed. It's set once via StartSpanOptions at span creation, inherited by child spans, and carried through into the emitted FinishedSpan so exporters can act on it.