apm-application-toolkit/apm-toolkit-meter/src/main/java/org/apache/skywalking/apm/toolkit/meter/Histogram.java [78:95]:
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        protected Histogram create() {
            if (steps == null || steps.isEmpty()) {
                throw new IllegalArgumentException("Missing steps setting");
            }

            // sort and distinct the steps
            steps = steps.stream().distinct().sorted().collect(Collectors.toList());

            // verify steps with except min value
            if (steps.get(0) < minValue) {
                throw new IllegalArgumentException("Step[0] must be  bigger than min value");
            } else if (steps.get(0) != minValue) {
                // add the min value to the steps
                steps.add(0, minValue);
            }

            return new Histogram(meterId, steps);
        }
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apm-sniffer/apm-agent-core/src/main/java/org/apache/skywalking/apm/agent/core/meter/Histogram.java [135:152]:
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        protected Histogram create(MeterId meterId) {
            if (steps == null || steps.isEmpty()) {
                throw new IllegalArgumentException("Missing steps setting");
            }

            // sort and distinct the steps
            steps = steps.stream().distinct().sorted().collect(Collectors.toList());

            // verify steps with except min value
            if (steps.get(0) < minValue) {
                throw new IllegalArgumentException("Step[0] must be bigger than min value");
            } else if (steps.get(0) != minValue) {
                // add the min value to the steps
                steps.add(0, minValue);
            }

            return new Histogram(meterId, steps);
        }
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