docs: public static void logLevel(String level) {
          if (!Arrays.asList("TRACE", "DEBUG", "INFO", "WARN", "ERROR", "OFF").contains(level)) {
              throw new IllegalArgumentException("log level \"" + level + "\" is not legal it must be one of \"TRACE\", \"DEBUG\", \"INFO\", \"WARN\", \"ERROR\", \"OFF\"");
          }
          System.setProperty(MOCKSERVER_LOG_LEVEL, level);
          MockServerLogger.initialiseLogLevels();
      }