01Uptime against an objective
Availability is tracked against service level objectives: a target proportion of successful requests over a window, as described in Google’s SRE guidance [1].
KEY FACTAn SLO of 99.9% allows roughly 43 minutes of downtime in a 30-day month.
02What we watch
Monitoring follows the four golden signals: latency, traffic, errors and saturation [2].
References
- [1]Service Level Objectives · Google SRE Booksre.google/sre-book/service-level-objectives/
- [2]Monitoring Distributed Systems · Google SRE Booksre.google/sre-book/monitoring-distributed-systems/
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