`kv` support from log crate. Json formatter.

[sualehasif]

It seems like the default formatter doesnt support structured keys and values. Is there an easy way to support that with flexi.

is there a community supported json formatter for outputs. Given the details and messiness of json, would prefer a well written community resource :)

[emabee]

Writing some format-function with the help of the json should not be too difficult, but maybe I underestimate the use-case.
Would you provide some example log call and expected output?

[emabee]

With version 0.28 I added a feature kv and a feature 'json'. If you combine both you should have what you need.