---
title: "Grace Period — Definition | FourSight Glossary"
url: https://foursight.cloud/glossary/grace-period
description: "A buffer window after a missed check or heartbeat before the monitor alerts. Prevents flapping alerts from jobs that occasionally run a few minutes late."
lang: en
---

Back to glossary: https://foursight.cloud/glossary

Monitoring & Uptime

# Grace Period

A buffer window after a missed check or heartbeat before the monitor alerts. Prevents flapping alerts from jobs that occasionally run a few minutes late.

Source

- Google SRE Workbook — Alerting on SLOs (https://sre.google/workbook/alerting-on-slos/)

## Related terms

Uptime

The percentage of time a service is reachable and responding correctly over a given window.
https://foursight.cloud/glossary/uptime

Downtime

Any period during which a service fails to respond, returns errors, or is so degraded it is unusable.
https://foursight.cloud/glossary/downtime

SLA (Service Level Agreement)

A formal contract between a service provider and a customer that defines minimum service levels and the con…
https://foursight.cloud/glossary/sla

SLO (Service Level Objective)

An internal reliability target — for example, "99.9% of API requests succeed within 500 ms over a rolling 3…
https://foursight.cloud/glossary/slo

SLI (Service Level Indicator)

The raw measurement that an SLO is calculated from — request success ratio, latency percentile, or freshnes…
https://foursight.cloud/glossary/sli

MTTR (Mean Time To Resolve / Recover)

Average time between an incident being detected and the service being fully restored.
https://foursight.cloud/glossary/mttr

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