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interface PreviewContext {
   
	 // all records from the stage identified by identifier    
	<T> Iterator<T> getOutputRecords(StringPreviewId identifier);
   
	 // all metrics from the stage identified by identifier
	Collection<MetricTimeSeries> getMetrics(StringPreviewId identifier);
  
 	 // all logs from the stage identified by identifier
	String getLogs(StringPreviewId identifier);
}