Retrieves a heartbeat

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

{
  "data": {
    "id": "4f6938ef-5983-4959-9eb9-6549a01e135a",
    "type": "heartbeats",
    "attributes": {
      "slug": "perspiciatis-dolor-neque-nam",
      "name": "Perspiciatis dolor neque nam.",
      "description": "Dignissimos assumenda suscipit dolor.",
      "alert_summary": "API is down",
      "alert_description": null,
      "alert_urgency_id": "6dcab15b-ac8a-48ba-a96c-0c01ba26072d",
      "interval": 6,
      "interval_unit": "minutes",
      "notification_target_id": "177",
      "notification_target_type": "User",
      "ping_url": "http://localhost:3001/v1/heartbeats/4f6938ef-5983-4959-9eb9-6549a01e135a/ping",
      "secret": "heartbeat_cb8c33cebaef8f50b3dfef49d55b342d279a433ab001d3776634dfab980f8764",
      "email_address": "heartbeat-45600df43d6030bb848ca34a4c99a673@test.email.rootly.com",
      "last_pinged_at": null,
      "expires_at": null,
      "enabled": false,
      "status": "waiting",
      "updated_at": "2025-10-05T17:24:55.335-07:00",
      "created_at": "2025-10-05T17:24:55.335-07:00"
    }
  }
}