code: public List<MetricInner> listMetrics(String resourceGroupName, String serverName, String databaseName, String filter) {
          return listMetricsWithServiceResponseAsync(resourceGroupName, serverName, databaseName, filter).toBlocking().single().body();
      }
docs: Returns database metrics.
  
  @param resourceGroupName The name of the resource group that contains the resource. You can obtain this value from the Azure Resource Manager API or the portal.
  @param serverName The name of the server.
  @param databaseName The name of the database.
  @param filter An OData filter expression that describes a subset of metrics to return.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @throws CloudException thrown if the request is rejected by server
  @throws RuntimeException all other wrapped checked exceptions if the request fails to be sent
  @return the List&lt;MetricInner&gt; object if successful.