Heartbeat Monitor
Also known as: cron monitor, dead-man's switch
A monitor that expects your job, script, or worker to ping it on a schedule. If the expected ping doesn't arrive within a grace period, the monitor alerts — catching silent failures.
Source
- MDN Web Docs — HTTP request methods
Related terms
Uptime
The percentage of time a service is reachable and responding correctly over a given window.
Downtime
Any period during which a service fails to respond, returns errors, or is so degraded it is unusable.
SLA (Service Level Agreement)
A formal contract between a service provider and a customer that defines minimum service levels and the con…
SLO (Service Level Objective)
An internal reliability target — for example, "99.9% of API requests succeed within 500 ms over a rolling 3…
SLI (Service Level Indicator)
The raw measurement that an SLO is calculated from — request success ratio, latency percentile, or freshnes…
MTTR (Mean Time To Resolve / Recover)
Average time between an incident being detected and the service being fully restored.