- Change k8s `api_server` default value from `http://127.0.0.1:9091` to `https://kubernetes.default.svc:443`
- `emqx_ctl conf show cluster` no longer displays irrelevant configuration items, such as when `discovery_strategy=static`,
it will not display configuration information related to `etcd/k8s/dns`.
- Remove `zones`(deprecated config key) from `emqx_ctl conf show_keys`