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

    AlertStateSummary that = (AlertStateSummary) o;

    if (Ok != null ? !Ok.equals(that.Ok) : that.Ok != null) return false;
    if (Warning != null ? !Warning.equals(that.Warning) : that.Warning != null) return false;
    if (Critical != null ? !Critical.equals(that.Critical) : that.Critical != null) return false;
    return Unknown != null ? Unknown.equals(that.Unknown) : that.Unknown == null;
  }
The {@link AlertState#UNKNOWN} state information.
ambari-server/src/main/java/org/apache/ambari/server/api/query/render/AlertStateSummary.java