schneiderlin opened a new issue, #11311:
URL: https://github.com/apache/dubbo/issues/11311

   the same issue as #3343, the problem is not solved, and I'd like to reopen 
it.
   
   my use case is that I need to AB test some providers. each provider would 
add custom data like "tag: A/B" in the registry.
   so that I can implement a `Router`, like this
   ```
   RouterResult<Invoker<T>> route(List<Invoker<T>> invokers, URL url, 
Invocation invocation,
                                                        boolean 
needToPrintMessage) throws RpcException {
       var filteredInvokers = filterABTest(invokers) // filter by 
`invoker.getUrl().getParameter("tag")`
       return new RouterResult<>(route(filteredInvokers, url, invocation));
   }
   ```


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