Retrieves a heartbeat

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

{
  "data": {
    "id": "53401f10-f512-4743-bddd-7885b6978571",
    "type": "heartbeats",
    "attributes": {
      "slug": "nemo-dolore-eaque-dolores",
      "name": "Nemo dolore eaque dolores.",
      "description": "Praesentium laborum qui in.",
      "alert_summary": "API is down",
      "alert_description": null,
      "alert_urgency_id": "0fa870e2-dd45-4158-b56c-b010b0ab2693",
      "interval": 8,
      "interval_unit": "hours",
      "notification_target_id": "210",
      "notification_target_type": "User",
      "ping_url": "http://localhost:3001/v1/heartbeats/53401f10-f512-4743-bddd-7885b6978571/ping",
      "secret": "heartbeat_79fd4762ab7f2a00e9e0d8c0763dc052586b7f2e19375d5e591aff3ff8af83bd",
      "email_address": "heartbeat-4018d699cb0af245f2300cebffdca882@test.email.rootly.com",
      "last_pinged_at": null,
      "expires_at": null,
      "enabled": false,
      "status": "waiting",
      "updated_at": "2025-11-05T08:29:46.327-08:00",
      "created_at": "2025-11-05T08:29:46.327-08:00"
    }
  }
}