Retrieves an alert routing rule

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

{
  "data": {
    "id": "6369f9c7-da1c-4587-ab3a-328e0672bb65",
    "type": "alert_routing_rules",
    "attributes": {
      "name": "Alert Routing Rule 4",
      "alerts_source_id": "e485e111-e513-4cc1-b733-2e7e9dac2e11",
      "condition_type": "all",
      "enabled": false,
      "position": 1,
      "destination": {
        "target_type": "EscalationPolicy",
        "target_id": "4fbb2d6c-055f-490e-8483-08efdb4e3c2d"
      },
      "created_at": "2025-12-24T09:22:46.151-08:00",
      "updated_at": "2025-12-24T09:22:46.151-08:00",
      "destinations": [
        {
          "target_type": "EscalationPolicy",
          "target_id": "4fbb2d6c-055f-490e-8483-08efdb4e3c2d"
        }
      ],
      "conditions": []
    },
    "relationships": {
      "owning_teams": {
        "data": [
          {
            "id": "95fac7b5-b63e-430d-8f40-98e16f998397",
            "type": "groups"
          }
        ]
      }
    }
  }
}