code: public static void fatal(final Logger logger, final String format, final Object... params) {
  		fatal(logger, format, null, params);
  	}
docs: log message using the String.format API.
  
  @param logger
  the logger that will be used to log the message
  @param format
  the format string (the template string)
  @param params
  the parameters to be formatted into it the string format