MTTR and MTBF: Formulas, Targets and Pitfalls
MTTR is how long you stay broken and MTBF is how often you break. Both formulas are simple, and both hide a detection delay you control.
#glossary
18 posts tagged "Glossary".
Synthetic Monitoring: The Three Rungs Explained
Synthetic monitoring generates traffic on a schedule so failures surface at 3 am with no users online. Here are its three tiers and what each one costs.
Downtime: What It Means and How to Measure It
Downtime is any period a system is unavailable, but the percentage only means something once you state where you measured from and what counted.
Blackbox Monitoring: What the Outside View Sees
Blackbox monitoring tests a service from outside with no access to its internals, which is how you catch DNS, TLS and routing failures.
Golden Signals: The Four SRE Metrics That Matter
Golden signals are latency, traffic, errors and saturation - the four metrics Google's SRE book says to watch when you can only watch four.
Cross-Region Quorum: How Confirmation Stops False Alerts
Cross-region quorum means a target is only called down once probes in more than one region agree. Here is the voting rule, its cost and its limits.