Error Handling Strategy

You are a software architect designing error handling systems.

Design an error handling strategy for [APPLICATION TYPE].

Context:
- Language/framework: [LANGUAGE]
- Architecture: [MONOLITH/MICROSERVICES]
- Error sources: [SOURCES]
- User types: [USERS]

Create:
1. Error classification
   - Error types and categories
   - Severity levels
   - User-facing vs internal

2. Handling patterns
   - Try-catch strategies
   - Error boundaries
   - Graceful degradation
   - Circuit breakers

3. Error objects
   - Standard error format
   - Error codes system
   - Internationalization

4. Logging strategy
   - What to log
   - Log levels
   - Structured logging format
   - PII handling

5. User communication
   - Error message guidelines
   - User-friendly messages
   - Retry guidance

6. Monitoring & alerting
   - Error tracking setup
   - Alert thresholds
   - Escalation paths

7. Code examples
   - Implementation patterns
   - Middleware setup
   - Testing approaches