oap-server/server-core/src/main/java/org/apache/skywalking/oap/server/core/analysis/meter/function/avg/AvgHistogramPercentileFunction.java [231:274]:
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                       },
                       DataTable::append
                   ))))
                   .forEach((labels, subDataset) -> {
                       long total;
                       total = subDataset.sumOfValues();

                    int[] roofs = new int[ranks.size()];
                    for (int i = 0; i < ranks.size(); i++) {
                        roofs[i] = Math.round(total * ranks.get(i) * 1.0f / 100);
                    }

                    int count = 0;
                    final List<String> sortedKeys = subDataset.sortedKeys(Comparator.comparingLong(Long::parseLong));

                    int loopIndex = 0;

                    for (String key : sortedKeys) {
                        final Long value = subDataset.get(key);

                        count += value;
                        for (int rankIdx = loopIndex; rankIdx < roofs.length; rankIdx++) {
                            int roof = roofs[rankIdx];

                            if (count >= roof) {
                                if (labels.isEmpty()) {
                                    labels.put(PERCENTILE_LABEL_NAME, String.valueOf(ranks.get(rankIdx)));
                                    percentileValues.put(labels, Long.parseLong(key));
                                } else {
                                    labels.put(PERCENTILE_LABEL_NAME, String.valueOf(ranks.get(rankIdx)));
                                    percentileValues.put(labels, Long.parseLong(key));
                                }
                                loopIndex++;
                            } else {
                                break;
                            }
                        }
                    }
                });
        }
    }

    @Override
    public Metrics toHour() {
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oap-server/server-core/src/main/java/org/apache/skywalking/oap/server/core/analysis/meter/function/sum/SumHistogramPercentileFunction.java [197:240]:
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                       },
                       DataTable::append
                   ))))
                   .forEach((labels, subDataset) -> {
                       long total;
                       total = subDataset.sumOfValues();

                    int[] roofs = new int[ranks.size()];
                    for (int i = 0; i < ranks.size(); i++) {
                        roofs[i] = Math.round(total * ranks.get(i) * 1.0f / 100);
                    }

                    int count = 0;
                    final List<String> sortedKeys = subDataset.sortedKeys(Comparator.comparingLong(Long::parseLong));

                    int loopIndex = 0;

                    for (String key : sortedKeys) {
                        final Long value = subDataset.get(key);

                        count += value;
                        for (int rankIdx = loopIndex; rankIdx < roofs.length; rankIdx++) {
                            int roof = roofs[rankIdx];

                            if (count >= roof) {
                                if (labels.isEmpty()) {
                                    labels.put(PERCENTILE_LABEL_NAME, String.valueOf(ranks.get(rankIdx)));
                                    percentileValues.put(labels, Long.parseLong(key));
                                } else {
                                    labels.put(PERCENTILE_LABEL_NAME, String.valueOf(ranks.get(rankIdx)));
                                    percentileValues.put(labels, Long.parseLong(key));
                                }
                                loopIndex++;
                            } else {
                                break;
                            }
                        }
                    }
                });
        }
    }

    @Override
    public Metrics toHour() {
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