private long getValue(Sample sample) {
        if (sample.getValue() <= 0.0) {
            return 0L;
        }
        if (sample.getValue() < 1.0) {
            return 1L;
        }
        return Math.round(sample.getValue());
    }
analyse intends to parse expression with input samples to meter-system metrics.

@param sampleFamilies input samples.
oap-server/analyzer/meter-analyzer/src/main/java/org/apache/skywalking/oap/meter/analyzer/Analyzer.java