What Is an Incident? Definition, Types, and Lifecycle

Engineering teams often grapple with determining what constitutes an incident during service disruptions, as an incident is defined as any unplanned event that disrupts or degrades service quality and necessitates a response. The distinction between incidents and other terms like events, problems, and outages is crucial for effective incident management, which involves structured processes from detection to postmortem. Incidents are categorized by severity and priority, influencing response urgency and resource allocation, with SEV1 to SEV4/SEV5 scales commonly used for classification. The incident lifecycle includes detection, response, diagnosis, resolution, and learning, each with associated metrics such as MTTD, MTTA, and MTTR, to improve response efficiency and prevent recurrence. Effective incident management relies on clear definitions, role assignments, and robust tooling to ensure rapid response and resolution, minimizing the impact on services and customers.

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