message: fix issue with MetricsMarkerLogbackFilter
diff: @@ -10,6 +10,8 @@ import com.ryantenney.metrics.spring.config.annotation.MetricsConfigurerAdapter;
  import io.github.jhipster.config.JHipsterProperties;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  +import org.slf4j.Marker;
  +import org.slf4j.MarkerFactory;
  import org.springframework.context.annotation.Bean;
  import org.springframework.context.annotation.Configuration;
  @@ -65,6 +67,7 @@ public class MetricsConfiguration extends MetricsConfigurerAdapter {
  }
  if (jHipsterProperties.getMetrics().getLogs().isEnabled()) {
  log.info("Initializing Metrics Log reporting");
  + Marker metricsMarker = MarkerFactory.getMarker("metrics");
  final Slf4jReporter reporter = Slf4jReporter.forRegistry(metricRegistry)
  .outputTo(LoggerFactory.getLogger("metrics"))
  .convertRatesTo(TimeUnit.SECONDS)
  