Analyzer buildAnalyzer(final String metricsName,
                           final String filter,
                           final String exp,
                           final MeterSystem service) {
        return Analyzer.build(
            metricsName,
            filter,
            exp,
            service
        );
    }
MetricConvert converts {@link SampleFamily} collection to meter-system metrics, then store them to backend storage.
oap-server/analyzer/meter-analyzer/src/main/java/org/apache/skywalking/oap/meter/analyzer/MetricConvert.java