logback-android/src/main/java/ch/qos/logback/core/BasicStatusManager.java
public boolean add(StatusListener listener) {
    synchronized (statusListenerListLock) {
      if (listener instanceof OnConsoleStatusListener) {
        boolean alreadyPresent = checkForPresence(statusListenerList, listener.getClass());
        if (alreadyPresent) {
          return false;
        }
      }
      statusListenerList.add(listener);
    }
    return true;
  }
public boolean add(StatusListener listener) {
    synchronized (statusListenerListLock) {
      if (listener instanceof OnConsoleStatusListener) {
        boolean alreadyPresent = checkForPresence(statusListenerList, listener.getClass());
        if (alreadyPresent) {
          return false;
        }
      }
      statusListenerList.add(listener);
    }
    return true;
  }
This implementation does not allow duplicate installations of OnConsoleStatusListener
@param listener