title: When not to use AsyncAppender in logback by default
body: <p>Logback supports using an async appender with the class 
  <code>ch.qos.Logback.classic.AsyncAppender</code> and according to the documentation, this will reduce the logging overhead on the application. So, why not just make it the default out of the box. What usecases are better served by using a sync appender. One problem I can see with the Async appender is that the log messages will not be chronological. Are there any other such limitations?</p>