title: log4j adds "sg" to each logged line
body: <p>First time using log4j. 
  I did not set up a log4j.properties file, since the logs are being written to different folders with every restart. I'm aware I could change the properties file at runtime, perhaps going to implement that later.</p>
  
  <p>So my whole configuration is this now:</p>
  
  <pre><code>private static Logger createLogger(){
      Logger logger = Logger.getLogger(Main.class);
      PatternLayout layout = new PatternLayout("%d{HH:mm:ss.SSS} [%t] %msg%n");
      logger.addAppender(new ConsoleAppender(layout));
      FileAppender logFileAppender = null;
      try {
          logFileAppender = new FileAppender(layout, getLogFile(), true);
      } catch (IOException e) {
          e.printStackTrace();
          System.exit(2);
      }
      logger.addAppender(logFileAppender);
      return logger;
  }
  </code></pre>
  
  <p>Which gives me such lines with "sg" in the end:</p>
  
  <pre><code>10:04:21.854 [main] System: Activated Botsg
  </code></pre>
  
  <p>How can I avoid "sg"?</p>
  
  <p>OpenJDK 11,
  Intellij 19.3,
  Windows 10 1903
  Latest log4j from mvn repositories</p>