logback-android/src/main/java/ch/qos/logback/classic/AsyncAppender.java
protected boolean isDiscardable(ILoggingEvent event) {
    Level level = event.getLevel();
    return level.toInt() <= Level.INFO_INT;
  }
protected boolean isDiscardable(ILoggingEvent event) {
    Level level = event.getLevel();
    return level.toInt() <= Level.INFO_INT;
  }
Events of level TRACE, DEBUG and INFO are deemed to be discardable.
@param event
@return true if the event is of level TRACE, DEBUG or INFO false otherwise.