Retrieves an alert group

curl --request GET \
  --url https://api.rootly.com/v1/alert_groups/{id} \
  --header 'Authorization: Bearer <token>'

{
  "data": {
    "id": "5cebb70f-1a6d-4a0a-8739-3d6ac2387c60",
    "type": "alert_groups",
    "attributes": {
      "name": "123 test group",
      "slug": "123-test-group",
      "description": null,
      "time_window": 10,
      "condition_type": "any",
      "deleted_at": null,
      "created_at": "2026-01-09T09:03:36.743-08:00",
      "updated_at": "2026-01-09T09:03:36.743-08:00",
      "group_by_alert_title": false,
      "group_by_alert_urgency": false,
      "targets": [
        {
          "id": "4892d3b6-92a0-49e3-a3d2-4c846cdaf2ab",
          "alert_group_id": "5cebb70f-1a6d-4a0a-8739-3d6ac2387c60",
          "created_at": "2026-01-09T09:03:36.747-08:00",
          "deleted_at": null,
          "target_id": "2dccd8fa-8da4-4f09-a78c-0b4b43f41f61",
          "target_type": "Service",
          "updated_at": "2026-01-09T09:03:36.747-08:00"
        }
      ],
      "attributes": []
    }
  }
}