gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/structure/io/graphson/GraphSONSerializersV2.java [377:394]:
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        public void serialize(final Metrics metrics, final JsonGenerator jsonGenerator,
                              final SerializerProvider serializerProvider) throws IOException {
            final Map<String, Object> m = new HashMap<>();
            m.put(GraphSONTokens.ID, metrics.getId());
            m.put(GraphSONTokens.NAME, metrics.getName());
            m.put(GraphSONTokens.COUNTS, metrics.getCounts());
            m.put(GraphSONTokens.DURATION, metrics.getDuration(TimeUnit.NANOSECONDS) / 1000000d);

            if (!metrics.getAnnotations().isEmpty()) {
                m.put(GraphSONTokens.ANNOTATIONS, metrics.getAnnotations());
            }
            if (!metrics.getNested().isEmpty()) {
                final List<Metrics> nested = new ArrayList<>();
                metrics.getNested().forEach(it -> nested.add(it));
                m.put(GraphSONTokens.METRICS, nested);
            }
            jsonGenerator.writeObject(m);
        }
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gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/structure/io/graphson/GraphSONSerializersV3.java [400:417]:
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        public void serialize(final Metrics metrics, final JsonGenerator jsonGenerator,
                              final SerializerProvider serializerProvider) throws IOException {
            final Map<String, Object> m = new HashMap<>();
            m.put(GraphSONTokens.ID, metrics.getId());
            m.put(GraphSONTokens.NAME, metrics.getName());
            m.put(GraphSONTokens.COUNTS, metrics.getCounts());
            m.put(GraphSONTokens.DURATION, metrics.getDuration(TimeUnit.NANOSECONDS) / 1000000d);

            if (!metrics.getAnnotations().isEmpty()) {
                m.put(GraphSONTokens.ANNOTATIONS, metrics.getAnnotations());
            }
            if (!metrics.getNested().isEmpty()) {
                final List<Metrics> nested = new ArrayList<>();
                metrics.getNested().forEach(it -> nested.add(it));
                m.put(GraphSONTokens.METRICS, nested);
            }
            jsonGenerator.writeObject(m);
        }
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