New metric - omada_controller_cloud_connected

[gmoscalu]

Reverse-engineering the GUI, i stumbled into the following call which could be exposed if you have an interest on it:

API Call:
curl -sk https://${OMADA_HOST}/api/v2/anon/initialization?_=1729584355

API Response:

{
  "errorCode": 0,
  "msg": "Success.",
  "result": {
    "configured": true,
    "omadacloudUrl": "https://omada.tplinkcloud.com",
    "category": "advanced",
    "supportSiteTemplate": false
  }
}