Retrieves a heartbeat

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

{
  "data": {
    "id": "bbbe5cf5-37f4-4fbf-81f9-00b21edd99af",
    "type": "heartbeats",
    "attributes": {
      "slug": "occaecati-ipsam-aut-laboriosam",
      "name": "Occaecati ipsam aut laboriosam.",
      "description": "Qui ipsa et saepe.",
      "alert_summary": "API is down",
      "alert_description": null,
      "alert_urgency_id": "76a10eb4-2178-4fea-bd72-72c5bed8a8d8",
      "interval": 1,
      "interval_unit": "minutes",
      "notification_target_id": "226",
      "notification_target_type": "User",
      "ping_url": "http://localhost:3001/v1/heartbeats/bbbe5cf5-37f4-4fbf-81f9-00b21edd99af/ping",
      "secret": "heartbeat_b73a69affc96054fb210bd99bff78faff774da56f3df79faeb54c810c142c720",
      "email_address": "[email protected]",
      "last_pinged_at": null,
      "expires_at": null,
      "enabled": false,
      "status": "waiting",
      "updated_at": "2025-12-19T14:54:26.133-08:00",
      "created_at": "2025-12-19T14:54:26.133-08:00"
    }
  }
}