public default UUID getUUID() {
        return null;
    }
Returns a UUID that uniquely identifies this record. If provided, this
UUID MUST be deterministic and unique across all {@link ActivityRecord}
objects within the same {@link ActivityRecordSet}, and SHOULD be unique
across all {@link ActivityRecord} objects.

@return
    A UUID that uniquely identifies this record, or null if no such
    unique identifier exists.
guacamole-ext/src/main/java/org/apache/guacamole/net/auth/ActivityRecord.java