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Fan-out: runtime-resolved target lists #65762

@Lee-W

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@Lee-W

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Allow to_downstream to resolve its target list at runtime rather than at authoring time. Example: per-tenant daily processing where the tenant set evolves; per-variant experiment metrics where variants launch and retire throughout the week. Intersects with #44146, which provides the runtime-state substrate. (Possibly can be resolved by #44146 directly?)

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#65654, #44146

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  • I acknowledge that I am a maintainer/committer of the Apache Airflow project.

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