Retrieves a heartbeat

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

{
  "data": {
    "id": "d17e0f56-b894-45d1-b7d6-3002e9595472",
    "type": "heartbeats",
    "attributes": {
      "slug": "vel-iusto-sit-recusandae",
      "name": "Vel iusto sit recusandae.",
      "description": "Nihil aperiam quia perspiciatis.",
      "alert_summary": "API is down",
      "alert_description": null,
      "alert_urgency_id": "5a57348e-bb4f-42e5-9643-a910085c2fee",
      "interval": 7,
      "interval_unit": "hours",
      "notification_target_id": "177",
      "notification_target_type": "User",
      "ping_url": "http://localhost:3001/v1/heartbeats/d17e0f56-b894-45d1-b7d6-3002e9595472/ping",
      "secret": "heartbeat_18e0053ba5eb1b9223bda0043427bf0eeeb4bfea2815419effa6a120461320b4",
      "last_pinged_at": null,
      "expires_at": null,
      "enabled": false,
      "status": "waiting",
      "updated_at": "2025-09-15T11:29:47.631-07:00",
      "created_at": "2025-09-15T11:29:47.631-07:00"
    }
  }
}