private void createMetric(final ScopeType scopeType,
                              final String dataType,
                              final DownsamplingType downsamplingType) {
        String downSamplingStr = CaseUtils.toCamelCase(downsamplingType.toString().toLowerCase(), false, '_');
        String functionName = String.format("%s%s", downSamplingStr, StringUtils.capitalize(dataType));
        meterSystem.create(metricName, functionName, scopeType);
    }
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