Implement --containers option in json exporter

[bpetit]

Problem

I'd like to get container labels to metrics I get from json exporter, but the option doesn't exist yet, like it does in prometheus container.

Solution

Implement the --containers option in json exporter.

[bpetit]

Example of usage

scaphandre --no-header json --containers --max-top-consumers=15 | jq

[hrexha28]

Hi,
I tried to use the --containers option with lxd containers but i get null in the container field for the json exorter.
Is there any way to get the linux container power number?
Thanks

[bpetit]

@hrexha28 I've seen your issue, thanks. Will have a look at this for next releases.