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The usage of Latency can be defined in Odysseus Script with the #METADATA command or in the Access operator with the METAATTRIBUTE parameter.
Note, that the timestamps in minlstart, etc. do not have any relation to the stream time or system time. It is just a measurement of the JVM since some point in time. For further details on this topic, see https://docs.oracle.com/javase/8/docs/api/java/lang/System.html#nanoTime-- .