code: @Reference(
              name = "carbon.metrics.management.service",
              service = MetricManagementService.class,
              cardinality = ReferenceCardinality.MANDATORY,
              policy = ReferencePolicy.DYNAMIC,
              unbind = "unsetMetricManagementService"
      )
      protected void setMetricManagementService(MetricManagementService metricManagementService) {
          DataHolder.getInstance().setMetricManagementService(metricManagementService);
      }
docs: This bind method will be called when {@link MetricManagementService} is registered.
  
  @param metricManagementService The {@link MetricManagementService} instance registered as an OSGi service