public void toMeter(final ImmutableMap<String, SampleFamily> sampleFamilies) {
        Preconditions.checkNotNull(sampleFamilies);
        if (sampleFamilies.size() < 1) {
            return;
        }
        for (Analyzer each : analyzers) {
            try {
                each.analyse(sampleFamilies);
            } catch (Throwable t) {
                log.error("Analyze {} error", each, t);
            }
        }
    }
toMeter transforms {@link SampleFamily} collection  to meter-system metrics.

@param sampleFamilies {@link SampleFamily} collection.
oap-server/analyzer/meter-analyzer/src/main/java/org/apache/skywalking/oap/meter/analyzer/MetricConvert.java