code: public static synchronized void updateLog(Map<String, Object> newConfig) {
          if (newConfig == null)
              throw new NullPointerException("Updated config must not be null");
  
          HpelTraceServiceConfig config = loggingConfig.get();
          if (config != null) {
              config.updateLog(newConfig);
              config.getTrDelegate().update(config);
          }
      }
docs: Update Log part of HPEL with new configuration values (based on injection via config
  admin). The parameter map should be modified to match actual values used
  (e.g. substitution in case of error).
  
  @param newConfig