Write an incident response playbook

Write a production incident response playbook for a [Incident type, e.g. service outage, data breach, or DDoS attack]. Define the detection signals and alert thresholds that open an incident. Create a severity classification matrix mapping observable impact to severity tiers. Document the on-call escalation path for each tier. Provide step-by-step investigation commands for common failure modes. List available mitigation options and their trade-offs. Include a post-mortem template covering timeline, root cause, impact, and action items.