ln-627-observability-auditor

name	ln-627-observability-auditor
description	Observability audit worker (L3). Checks structured logging, health check endpoints, metrics collection, request tracing, log levels. Returns findings with severity, location, effort, recommendations.
allowed-tools	Read, Grep, Glob, Bash

Paths: File paths (shared/, references/, ../ln-*) are relative to skills repo root. If not found at CWD, locate this SKILL.md directory and go up one level for repo root.

Observability Auditor (L3 Worker)

Specialized worker auditing logging, monitoring, and observability.

Purpose & Scope

• Worker in ln-620 coordinator pipeline
• Audit observability (Category 10: Medium Priority)
• Check logging, health checks, metrics, tracing
• Calculate compliance score (X/10)

Inputs (from Coordinator)

Receives contextStore with tech stack, framework, codebase root, output_dir.

Workflow

1. Parse context + output_dir
2. Check observability patterns
3. Collect findings
4. Calculate score
5. Write Report: Build full markdown report in memory per shared/templates/audit_worker_report_template.md, write to {output_dir}/627-observability.md in single Write call
6. Return Summary: Return minimal summary to coordinator

Audit Rules

1. Structured Logging

Detection:

• Grep for console.log (unstructured)
• Check for proper logger: winston, pino, logrus, zap

Severity:

• MEDIUM: Production code using console.log
• LOW: Dev code using console.log

Recommendation: Use structured logger (winston, pino)

Effort: M (add logger, replace calls)

2. Health Check Endpoints

Detection:

• Grep for /health, /ready, /live routes
• Check API route definitions

Severity:

• HIGH: No health check endpoint (monitoring blind spot)

Recommendation: Add /health endpoint

Effort: S (add simple route)

3. Metrics Collection

Detection:

• Check for Prometheus client, StatsD, CloudWatch
• Grep for metric recording: histogram, counter

Severity:

• MEDIUM: No metrics instrumentation

Recommendation: Add Prometheus metrics

Effort: M (instrument code)

4. Request Tracing

Detection:

• Check for correlation IDs in logs
• Verify trace propagation (OpenTelemetry, Zipkin)

Severity:

• MEDIUM: No correlation IDs (hard to debug distributed systems)

Recommendation: Add request ID middleware

Effort: M (add middleware, propagate IDs)

5. Log Levels

Detection:

• Check if logger supports levels (info, warn, error, debug)
• Verify proper level usage

Severity:

• LOW: Only error logging (insufficient visibility)

Recommendation: Add info/debug logs

Effort: S (add log statements)

Scoring Algorithm

MANDATORY READ: Load shared/references/audit_scoring.md for unified scoring formula.

Output Format

MANDATORY READ: Load shared/templates/audit_worker_report_template.md for file format.

Write report to {output_dir}/627-observability.md with category: "Observability" and checks: structured_logging, health_endpoints, metrics_collection, request_tracing, log_levels.

Return summary to coordinator:

Report written: docs/project/.audit/ln-620/{YYYY-MM-DD}/627-observability.md
Score: X.X/10 | Issues: N (C:N H:N M:N L:N)

Reference Files

• Worker report template: shared/templates/audit_worker_report_template.md
• Audit scoring formula: shared/references/audit_scoring.md
• Audit output schema: shared/references/audit_output_schema.md

Critical Rules

• Do not auto-fix: Report only, never inject logging or endpoints
• Framework-aware detection: Adapt patterns to project's tech stack (winston/pino for Node, logrus/zap for Go, etc.)
• Effort realism: S = <1h, M = 1-4h, L = >4h
• Exclusions: Skip test files for console.log detection, skip dev-only scripts
• Context-sensitive severity: console.log in production code = MEDIUM, in dev utilities = LOW

Definition of Done

• contextStore parsed (tech stack, framework, output_dir)
• All 5 checks completed (structured logging, health endpoints, metrics, request tracing, log levels)
• Findings collected with severity, location, effort, recommendation
• Score calculated per shared/references/audit_scoring.md
• Report written to {output_dir}/627-observability.md (atomic single Write call)
• Summary returned to coordinator

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Version: 3.0.0 Last Updated: 2025-12-23