Juju command to display non-default config values

[Connor Chamberlain]

There are times when it would be convenient to quickly see which configs for a given application have a non-default value. Currently, we can achieve this effect by performing an export-bundle, but it is slow and wasteful for this purpose, as it generates far more data than is required.

I would like to be able to run something like `juju config $app --non-default` or `juju non-default-configs $app` and see all configs for $app which have been modified.

[Nobuto Murata (nobuto)]

Fwiw, Juju keeps "source: user" for those values modified by an user so you can query it like:

$ juju config keystone --format json \
    | jq -c '.settings | to_entries[] | select(.value.source=="user").key'

"openstack-origin"
"os-admin-hostname"
"os-internal-hostname"
"os-public-hostname"
"region"
"vip"

$ juju config keystone --format json \
    | jq -c '.settings | to_entries[] | select(.value.source=="user") | [.key, .value.value]'

["openstack-origin","cloud:focal-yoga"]
["os-admin-hostname","admin.my.example.com"]
["os-internal-hostname","internal.my.example.com"]
["os-public-hostname","public.my.example.com"]
["region","myRegion"]
["vip","10.100.0.11"]