Healthchecking in Lua

Hi,

I am trying to deploy various custom and stateful origins behind an Envoy gateway. These origins may have arbitrary logic to their healthchecks such that for a certain type one may want to check if the response is 200 OK and valid JSON with a "foo" key and a "bar" value, and mark the origin healthy if and only if that's the case while some other origin might be okay with just a 200 OK and an empty response body.

As it stands, I think this kind of feature would involve creating a new Healthcheck Filter. Has this been abstracted away by another filter? Any suggestions for such a use case would be appreciated.

Thanks.