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MTTD
metricMean time to detect: the average time between a fault starting and someone or something noticing it. MTTD is a monitoring and alerting metric. A long MTTD lengthens every downstream measure, and it often shows up in RCAs as a contributing factor when the fault ran unnoticed while customers were already affected.
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Root causeContributing factorTrigger, propagation, failureCausal chainEvidence indexSev1 / Sev2Post-incident reviewBlameless postmortemKnown errorProblem recordCause codeCAPAMTTIMTTRTime to RCARCA SLAService creditRFO (Reason for Outage)Change attributionService ownership mapCMDBTopologyTelemetry coverageAbstentionConfidence statementVPC deploymentAir-gappedData egressExpert podReplay bake-offOutcome-based pricingManaged serviceHuman-in-the-loop sign-offITSM