logging-error-tracking-expert

Logging & Error Tracking Expert (2026 Edition)

English | Bahasa Indonesia

English

Orchestration & Integration

Connects and orchestrates with relevant domain skills like brainstorming, zero-to-prod-orchestrator, and project-context-mapper to ensure cohesive execution.

Description

Production-grade guide for implementing structured logging, error tracking, and application monitoring. Covers Pino (high-performance JSON logging), Sentry SDK integration (React, Node.js, Next.js), source map upload for production errors, request ID correlation across microservices, log aggregation (Axiom, Datadog, Logflare), alert rules, GDPR-compliant log redaction (PII masking), and OpenTelemetry integration.

Trigger Conditions

Activate this skill when:

• Setting up structured logging for Node.js/Bun backend services.
• Integrating Sentry for error tracking in React/Next.js apps.
• Implementing request ID correlation across microservices.
• Setting up log aggregation and search (Axiom, Datadog, Grafana Loki).
• Configuring alerting rules for production errors.
• Implementing GDPR-compliant log management (PII redaction).
• Setting up source map uploads for production debugging.

Logging Library Selection Guide

Recommendation: Use Pino for all production services (10x faster than Winston, native JSON).

1. Structured Logging with Pino

// lib/logger.ts
import pino from 'pino';

export const logger = pino({
  level: process.env.LOG_LEVEL ?? 'info',
  // Redact sensitive fields (GDPR/PII)
  redact: {
    paths: ['req.headers.authorization', 'req.headers.cookie', '*.password', '*.token', '*.ssn', '*.creditCard'],
    censor: '[REDACTED]',
  },
  // Standardized format
  formatters: {
    level: (label) => ({ level: label }),
    bindings: (bindings) => ({
      service: process.env.SERVICE_NAME ?? 'app',
      environment: process.env.NODE_ENV,
      version: process.env.APP_VERSION,
      pid: bindings.pid,
      hostname: bindings.hostname,
    }),
  },
  timestamp: pino.stdTimeFunctions.isoTime,
});

// Child logger for specific domain
export const dbLogger = logger.child({ module: 'database' });
export const authLogger = logger.child({ module: 'auth' });
export const paymentLogger = logger.child({ module: 'payment' });