Retrieves a heartbeat

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

{
  "data": {
    "id": "8750d431-3ea5-4293-8217-d809446cc986",
    "type": "heartbeats",
    "attributes": {
      "slug": "minima-omnis-veniam-laudantium",
      "name": "Minima omnis veniam laudantium.",
      "description": "Sunt tempore possimus molestias.",
      "alert_summary": "API is down",
      "alert_description": null,
      "alert_urgency_id": "534db1f3-82cf-49cd-927e-bcbfa8003550",
      "interval": 1,
      "interval_unit": "minutes",
      "notification_target_id": "570",
      "notification_target_type": "User",
      "ping_url": "http://localhost:3001/v1/heartbeats/8750d431-3ea5-4293-8217-d809446cc986/ping",
      "secret": "heartbeat_0f9e01a7de79f1c8067da332af4eaa3e5509dbfd79b290687f4e6cd15ffaff16",
      "email_address": "heartbeat-1d83454826806e0cf34347b580995389@test.email.rootly.com",
      "last_pinged_at": null,
      "expires_at": null,
      "enabled": false,
      "status": "waiting",
      "updated_at": "2026-02-17T18:10:17.758-08:00",
      "created_at": "2026-02-17T18:10:17.758-08:00"
    }
  }
}