@Override
  public boolean equals(Object o) {
    if (this == o) return true;
    if (o == null || getClass() != o.getClass()) return false;

    AlertUpdateEvent that = (AlertUpdateEvent) o;

    return summaries != null ? summaries.equals(that.summaries) : that.summaries == null;
  }
Alert summaries grouped by cluster id.
ambari-server/src/main/java/org/apache/ambari/server/events/AlertUpdateEvent.java