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SensorBehavior
sink-record-readRegistered by both. Counts records polled (same semantics).
sink-record-sendRegistered by both. Counts records delivered to task.put().
sink-record-active-countRegistered by both. In Share Groups, this is the number of records currently ACQUIRED but not yet acknowledged.
put-batch-timeRegistered by both. Time spent in task.put().

Proposed Changes

At‑Least‑Once (Share Group → SinkTask → External Sink)

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Exactly‑Once (Same‑Cluster Kafka‑to‑Kafka, KIP‑1289)

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4. Compatibility, Deprecation, and Migration Plan

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