Feature request: JSON output from "stolonctl status"

[charles-dyfis-net]

At present, parsing the output from "stolonctl status" requires ad-hoc text processing.

An option to provide JSON output would permit easier parsing (with tools such as jq), and provide a means for future extension (by adding additional keys without changing the meaning of existing ones) that wouldn't have potential to impact existing parsers.

With upstream approval/consensus, I'm willing to do the implementation myself.

[sgotti]

@charles-dyfis-net stolonctl status just parses the clusterdata, so another option could be to just parse the stolonctl clusterdata json output that contains all the available information. This is what we usually do in our monitoring scripts or for debugging.

I'm not against providing a json output to stolonctl status but it I'll just be a sort of redundant and reworked/cleaned cluster data and will need to be versioned since it could change (the current status output could be improved but it's currently enough for our needs)

[charles-dyfis-net]

Using clusterdata makes sense to me.