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Incident Investigation

Investigate production incidents with logs, metrics, and traces.

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Incident Investigation

Incident Response

1. Detect (alert/monitoring)
2. Triage (severity, impact)
3. Mitigate (fix/deploy rollback)
4. Investigate (root cause)
5. Post-mortem (prevent recurrence)

Post-Mortem Template

Section Content
Timeline What happened when
Impact Users affected
Root cause What went wrong
Fix How it was resolved
Prevention Action items

Key Points

  • Understanding Incident Investigation is essential for production systems
  • Always consider scalability and maintainability
  • Test thoroughly before deploying to production
  • Monitor performance and set up alerting

Common Patterns

  1. Validation: Always validate input at the boundary
  2. Error Handling: Use structured error responses
  3. Logging: Log key events for debugging
  4. Testing: Unit, integration, and load tests
  5. Documentation: Keep docs updated with code changes

Best Practices

Key Principles

  1. Follow SOLID principles
  2. Write clean, readable code
  3. Test thoroughly
  4. Document decisions
  5. Monitor in production

Implementation

  • Start simple, refactor as needed
  • Use established patterns
  • Consider trade-offs
  • Review with peers

Continuous Improvement

  • Learn from incidents
  • Update documentation
  • Share knowledge
  • Mentor others

Key Points

  • Understanding Incident Investigation is essential for production systems
  • Always consider scalability and maintainability
  • Test thoroughly before deploying to production
  • Monitor performance and set up alerting

Common Patterns

  1. Validation: Always validate input at the boundary
  2. Error Handling: Use structured error responses
  3. Logging: Log key events for debugging
  4. Testing: Unit, integration, and load tests
  5. Documentation: Keep docs updated with code changes

Practice Problems

0/3solved
Implement Incident Investigation

Design and implement a solution for Incident Investigation in a backend system. Consider scalability, error handling, and production readiness.

Solution
// Incident Investigation implementation
// Key aspects: validation, error handling, logging, testing

public class IncidentInvestigation {
    // Production-ready implementation
}
Incident Investigation Edge Cases

Identify and handle edge cases for Incident Investigation. What happens under high load, with invalid input, or during failures?

Solution
// Edge case handling:
// 1. Null/empty input -> validation
// 2. High load -> rate limiting, queuing
// 3. Failures -> retries, circuit breaker
// 4. Concurrent access -> locks, idempotency
Incident Investigation Testing Strategy

Write a testing strategy for Incident Investigation. Include unit tests, integration tests, and performance tests.

Solution
// Test plan:
// - Unit: 80% coverage target
// - Integration: API contracts
// - Performance: latency, throughput
// - Chaos: failure injection

Quiz

1. Post-mortem goal?

Question 1 options

2. Incident response first step?

Question 2 options

3. What is the primary purpose of Incident Investigation?

Question 3 options

4. What is a common mistake when implementing Incident Investigation?

Question 4 options

Flashcards

Question

Post-mortem goal?

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Answer

Prevent recurrence (no blame)

Question

Incident first step?

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Answer

Detect and triage

Question

What is Incident Investigation?

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Answer

Incident Investigation is a key concept in backend development.

Question

When to use Incident Investigation?

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Answer

Use Incident Investigation when building production systems that require reliability, scalability, and maintainability.

Question

Incident Investigation best practices

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Answer

Follow SOLID principles, write clean code, test thoroughly, document decisions, and monitor in production.

Revision Notes

Key Takeaways

  • 1.Incident response: detect → triage → mitigate → investigate
  • 2.Post-mortem: prevent recurrence, no blame
  • 3.Document timeline, impact, root cause, prevention

Interview Tips

  • •Conduct incident investigation
  • •Write effective post-mortems

Cheat Sheet

Incident Investigation

  • Response: detect → triage → mitigate → investigate
  • Post-mortem: prevent recurrence, no blame
  • Document: timeline, impact, root cause, prevention