Retrieves a heartbeat

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

{
  "data": {
    "id": "f9fc8f6f-afc0-4b75-84a1-421597882702",
    "type": "heartbeats",
    "attributes": {
      "slug": "vitae-autem-maiores-temporibus",
      "name": "Vitae autem maiores temporibus.",
      "description": "Hic dolores qui sed.",
      "alert_summary": "API is down",
      "alert_description": null,
      "alert_urgency_id": "5c7b750e-ace9-4c71-bf50-469ba7e71212",
      "interval": 1,
      "interval_unit": "minutes",
      "notification_target_id": "418",
      "notification_target_type": "User",
      "ping_url": "http://localhost:3001/v1/heartbeats/f9fc8f6f-afc0-4b75-84a1-421597882702/ping",
      "secret": "heartbeat_a38c7ec61733c2c479eb93000f5f19f479244a3805bffad8e2a14980d044fa11",
      "email_address": "[email protected]",
      "last_pinged_at": null,
      "expires_at": null,
      "enabled": false,
      "status": "waiting",
      "updated_at": "2026-01-13T20:43:53.246-08:00",
      "created_at": "2026-01-13T20:43:53.246-08:00"
    }
  }
}