Retrieve router metrics

curl --request GET \
  --url https://api.altostrat.io/api/routers/{router_id}/metrics \
  --header 'Authorization: Bearer <token>'

{
  "status": "<string>",
  "data": [
    {
      "date": "<string>",
      "minutes_down": 123,
      "percentage_down": 123
    }
  ]
}