SomeServiceHandler.java

public class SomeServiceHandler extends SomeServiceGrpc.SomeServiceImplBase {
    private static final String METRICS_PREFIX = "meter-api." + SomeServiceHandler.class.getSimpleName();
    /**
     * metric registry.
     */
    private MetricRegistry metricRegistry;
    // metricRegistry injected.
    public void setMetricRegistry(MetricRegistry metricRegistry) {
        this.metricRegistry = metricRegistry;
    }
    @Override
    public void doSearch(...) {
        this.metricRegistry.meter(METRICS_PREFIX + ".doSearch").mark();
        ...
    }
    @Override
    public void getSomeStatus(...) {
        this.metricRegistry.meter(METRICS_PREFIX + ".getSomeStatus").mark();
        ...
    }
}

some service handler.