@Override
    public final boolean combine(Metrics metrics) {
        final MinLabeledFunction minLabeledFunction = (MinLabeledFunction) metrics;
        this.value.setMinValue(minLabeledFunction.getValue());
        return true;
    }
Service ID is required for sort query.
oap-server/server-core/src/main/java/org/apache/skywalking/oap/server/core/analysis/meter/function/min/MinLabeledFunction.java