code: @Override
  	public void destroy() {
  		if (monitoringDisabled || !instanceEnabled) {
  			return;
  		}
  		final long start = System.currentTimeMillis();
  
  		try {
  			if (filterContext != null) {
  				filterContext.destroy();
  			}
  		} finally {
  			final String contextPath = Parameters.getContextPath(filterConfig.getServletContext());
  			CONTEXT_PATHS.remove(contextPath);
  			// nettoyage avant le retrait de la webapp au cas où celui-ci ne suffise pas
  			httpCounter = null;
  			errorCounter = null;
  			urlExcludePattern = null;
  			filterConfig = null;
  			filterContext = null;
  		}
  		final long duration = System.currentTimeMillis() - start;
  		LOG.debug("JavaMelody filter destroy done in " + duration + " ms");
  	}
docs: {@inheritDoc}