@GetMapping("/")
    public @ResponseBody String queryConsumer(
            @RequestParam Map<String, String> req) throws Exception {
        String url = masterService.getQueryUrl(req);
        return masterService.queryMaster(url);
    }
query the consumer group for certain topic

@param req
@return

@throws Exception the exception
inlong-tubemq/tubemq-manager/src/main/java/org/apache/inlong/tubemq/manager/controller/group/GroupController.java