private static String formatName(String metricsName) {
        return metricsName.toLowerCase();
    }
Active the {@link MetricsStreamProcessor#in(Metrics)} for streaming calculation.

@param acceptableValue should only be created through {@link #create(String, String, ScopeType, Class)}
oap-server/server-core/src/main/java/org/apache/skywalking/oap/server/core/analysis/meter/MeterSystem.java