How can we aggregate status code count by URIs?

[Jan Li]

Hi team,

       I'm using Prometheus plugin to monitor status code, but there is an
obstacle when we try to group status code by URI.

       Suppose we have such a route configuration:

       {"uri": "/event/*", vars: [["uri", "~~", "^/event/.*/subscribe"]]}

       And the actual request uri can be /event/12324829832/subscribe or
/event/3489284928/subscribe.

       But in Prometheus, we want to count response code on
^/event/.*/subscribe, is there any good way we can do this?