code: public synchronized void clearProperty(Object source, String name, Object value, boolean beforeUpdate) {
          if (beforeUpdate == false && isLog4JProperty(name)) {
              overrideProps.remove(name);
              reConfigureAsynchronously();
          }
      }
docs: /*
  (non-Javadoc)
  
  @see com.netflix.config.PropertyListener#clearProperty(java.lang.Object,
  java.lang.String, java.lang.Object, boolean)