protected void addRequiredAlertProperties(Set<String> properties) {
    properties.add(AlertResourceProvider.ALERT_STATE);
    properties.add(AlertResourceProvider.ALERT_ORIGINAL_TIMESTAMP);
    properties.add(AlertResourceProvider.ALERT_MAINTENANCE_STATE);
  }
Adds properties to the backend request that are required by this renderer.
This method currently adds {@link AlertResourceProvider#ALERT_STATE} and
{@link AlertResourceProvider#ALERT_ORIGINAL_TIMESTAMP}.

@param properties
         the properties collection to add to.
ambari-server/src/main/java/org/apache/ambari/server/api/query/render/AlertSummaryRenderer.java