logging-standards

name	logging-standards
description	Structured logging standards and best practices. Use when implementing logging in applications, debugging issues, or setting up log aggregation.
license	Apache 2.0

Logging Standards

When to Use This Skill

• Implementing logging
• Debugging production issues
• Setting up log aggregation

Core Concepts

Log Levels

Level	When
ERROR	Something failed
WARN	Unexpected but handled
INFO	Normal business events
DEBUG	Detailed technical info

logger.error('Database connection failed', { error: err.message });
logger.warn('Cache miss, falling back to database', { key });
logger.info('User created', { userId: user.id });
logger.debug('Processing request', { method, url });

Structured Logging

{
  "timestamp": "2024-01-15T10:30:00.000Z",
  "level": "INFO",
  "service": "user-service",
  "traceId": "abc-123",
  "message": "User created",
  "data": { "userId": "user-456" }
}

References

• 12-Factor App Logging