[Feature Request] Provide a JSON endpoint for the Pod's environment

[DazWilkin]

I may have missed this but, it would be useful to serve a JSON endpoint to facilitate use of e.g. curl.

I deployed kuard and then wanted to show different Pods responding behind Load-Balanced requests. Unaware of a JSON endpoint, I would have had to parse e.g. HOSTNAME from the HTML. Not impossible but it'd be sweet to have JSON results.