How to Fix Broken Incident Severity Levels with a Clear SEV-1 to SEV-5 Framework

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Most engineering teams have incident severity levels defined on paper, but inconsistent interpretation leads to missed escalations, alert fatigue, and breached SLOs. A practical framework defines SEV-1 through SEV-5 by user impact, revenue effect, and response time — ranging from a 5-minute critical outage response to a backlog-level informational alert. Severity should not remain static; incidents must auto-escalate if impact grows and any downgrade must be documented with written justification in the incident channel. A calibration matrix mapping user impact percentage against product availability helps teams assign severity quickly without relying on individual judgment. Teams can validate their definitions by having multiple SRE leads independently rate past incidents, with over 20% disagreement signaling a need for retraining.

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