KIP-424 — Allow suppression of intermediate events based on wall clock time

Discussion Streams

Extends Kafka Streams' KTable suppress operator with a wall-clock-time-based suppression option (via `Suppressed.untilTimeLimit(Duration, BufferConfig)`) in addition to the existing stream-time-based semantics. Stream-time-based suppression stalls indefinitely if no new events arrive, making it unusable for rate-capping aggregate emission in sparse or bursty IoT workloads where real time must govern flush cadence.

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