Retrieves a heartbeat

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

{
  "data": {
    "id": "6244c456-b4ad-4b0a-bc98-477153f7d1ca",
    "type": "heartbeats",
    "attributes": {
      "slug": "omnis-ut-doloribus-minima",
      "name": "Omnis ut doloribus minima.",
      "description": "Exercitationem dolorum consequatur quod.",
      "alert_summary": "API is down",
      "alert_description": null,
      "alert_urgency_id": "b28c3dc1-a002-476e-be23-833a81ef9eb4",
      "interval": 1,
      "interval_unit": "minutes",
      "notification_target_id": "418",
      "notification_target_type": "User",
      "ping_url": "http://localhost:3001/v1/heartbeats/6244c456-b4ad-4b0a-bc98-477153f7d1ca/ping",
      "secret": "heartbeat_9f541103fa1a299ba5ca25e719435b61c63df6224f925f673f4351bb9d1df334",
      "email_address": "[email protected]",
      "last_pinged_at": null,
      "expires_at": null,
      "enabled": false,
      "status": "waiting",
      "updated_at": "2026-01-16T12:40:41.116-08:00",
      "created_at": "2026-01-16T12:40:41.116-08:00"
    }
  }
}