public void setSkippable(Boolean skippable) {
      this.skippable = skippable;
    }
This class stores information needed to determine {@link Stage#status} and {@link Stage#displayStatus}
This information is cached for all {@link Stage} of all running {@link Request} at {@link #activeStageMap}
ambari-server/src/main/java/org/apache/ambari/server/events/listeners/tasks/TaskStatusListener.java