gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/structure/io/graphson/GraphSONSerializersV2.java [358:368]:
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        public void serialize(final TraversalMetrics traversalMetrics, final JsonGenerator jsonGenerator, final SerializerProvider serializerProvider)
                throws IOException {
            // creation of the map enables all the fields to be properly written with their type if required
            final Map<String, Object> m = new HashMap<>();
            m.put(GraphSONTokens.DURATION, traversalMetrics.getDuration(TimeUnit.NANOSECONDS) / 1000000d);
            final List<Metrics> metrics = new ArrayList<>();
            metrics.addAll(traversalMetrics.getMetrics());
            m.put(GraphSONTokens.METRICS, metrics);

            jsonGenerator.writeObject(m);
        }
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gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/structure/io/graphson/GraphSONSerializersV3.java [381:391]:
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        public void serialize(final TraversalMetrics traversalMetrics, final JsonGenerator jsonGenerator, final SerializerProvider serializerProvider)
                throws IOException {
            // creation of the map enables all the fields to be properly written with their type if required
            final Map<String, Object> m = new HashMap<>();
            m.put(GraphSONTokens.DURATION, traversalMetrics.getDuration(TimeUnit.NANOSECONDS) / 1000000d);
            final List<Metrics> metrics = new ArrayList<>();
            metrics.addAll(traversalMetrics.getMetrics());
            m.put(GraphSONTokens.METRICS, metrics);

            jsonGenerator.writeObject(m);
        }
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