# Heartbeat monitoring

> Detecting a dead service by expecting a regular signal from it and alerting when the signal stops.

URL: https://pagerless.dev/glossary/heartbeat-monitoring
Updated: 2026-10-22

## In Pagerless

SDKs send a heartbeat every 60 seconds; 5 minutes of silence is a floor that always wakes.

## Related terms

- [Check-in (cron monitoring)](https://pagerless.dev/glossary/check-in): A ping a scheduled job sends when it runs, so a monitor can alert when a run is late, missed or failed.
- [Uptime](https://pagerless.dev/glossary/uptime): The share of time a service is available