Quorum-based Monitoring
A monitoring technique where a failure is only declared when a majority of independent probes (e.g. 3 of 4 global regions) agree the target is down. Filters out single-region network blips.
Why it matters: Eliminates 20–40% of false-positive alerts caused by transient ISP or routing issues.
Source
- Wikipedia — Quorum (distributed computing)
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.
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