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  1. val mergedStream: KStream[String, SensorHeartbeat] =
  2. streamBuilder.merge(sensor1Stream, sensor2Stream, sensor3Stream, sensor4Stream)
  3.  
  4. mergedStream.to(Serdes.String(), heartbeatSerde, "Merged-SensorsHeartbeat")
  5.  
  6. val mergedStreamTable : KGroupedStream[String, SensorHeartbeat] =
  7. mergedStream.groupByKey(Serdes.String(), heartbeatSerde)
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