Incident Response Lifecycle: All 5 Phases Explained

The incident response lifecycle is a structured framework that guides engineering and security teams through handling IT service disruptions, consisting of five phases: Detection, Triage, Response, Resolution, and Post-Incident Review. Originating from cybersecurity frameworks like NIST SP 800-61, it has been adapted by SRE and DevOps communities for IT operations to address issues such as service outages and infrastructure failures. The lifecycle emphasizes the importance of all phases, including often-overlooked ones like detection optimization and post-incident review, which are crucial for improving reliability and reducing repeat failures. Metrics like Mean Time to Detect (MTTD), Mean Time to Acknowledge (MTTA), and Mean Time to Recover (MTTR) are used to measure the effectiveness of each phase, while roles such as the Incident Commander and Post-Incident Review Facilitator ensure that each phase is executed efficiently. The lifecycle's success relies on preparation, such as writing runbooks and configuring escalation policies, and on ensuring that post-incident action items are completed to prevent recurrence of the same incidents.

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