Creates a heartbeat

curl --request POST \
  --url https://api.rootly.com/v1/heartbeats \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/vnd.api+json' \
  --data '{
  "data": {
    "type": "heartbeats",
    "attributes": {
      "name": "<string>",
      "description": "<string>",
      "alert_summary": "<string>",
      "alert_description": "<string>",
      "alert_urgency_id": "<string>",
      "interval": 123,
      "interval_unit": "seconds",
      "notification_target_id": "<string>",
      "notification_target_type": "User",
      "enabled": true
    }
  }
}'

{
  "data": {
    "id": "d5c8ec34-c389-48bb-a023-e29444ed4142",
    "type": "heartbeats",
    "attributes": {
      "slug": "api",
      "name": "API",
      "description": "This is a description",
      "alert_summary": "API is down",
      "alert_description": "Check the API logs and runbook at /docs/api-troubleshooting",
      "alert_urgency_id": "e2ba5d0d-3ee6-4e76-86a6-2e851a734a1a",
      "interval": 1,
      "interval_unit": "minutes",
      "notification_target_id": "210",
      "notification_target_type": "User",
      "ping_url": "http://localhost:3001/v1/heartbeats/d5c8ec34-c389-48bb-a023-e29444ed4142/ping",
      "secret": "heartbeat_6d1d151a2bd358a91e6d080990101b63e2e1c8046a4aee0064feac4c2a7b2954",
      "email_address": "heartbeat-677874b482e80a0927d76e93a4734bc1@test.email.rootly.com",
      "last_pinged_at": null,
      "expires_at": null,
      "enabled": false,
      "status": "waiting",
      "updated_at": "2025-11-19T20:41:09.645-08:00",
      "created_at": "2025-11-19T20:41:09.645-08:00"
    }
  }
}