Security Logging

Collect, structure and retain the events required for detection, investigation and audit.

BeginnerLoggingOperationsGovernance

Where it fits in the lifecycle

  1. Plan
  2. Code
  3. Build
  4. Test
  5. Release
  6. Deploy
  7. Operate
  8. Monitor
  • Operate Runtime security, secrets rotation and configuration reconciliation.
  • Monitor Detection engineering, SIEM, compliance evidence and incident response.

Overview

Useful security logging means structured events with stable field names, tamper-resistant storage, and retention long enough to investigate a breach discovered months later.

Why it matters

Investigations are bounded by what was logged and how long it was kept.

How it works

  1. 01Applications emit structured JSON with correlation identifiers.
  2. 02Agents ship logs to central storage with restricted write access.
  3. 03Retention and immutability are configured per compliance requirement.

Common tools

Fluent BitLokiOpenTelemetryKubernetesLinuxAWS

Implementation examples

jsonStructured audit event
{  "ts": "2026-02-11T09:14:03Z",  "event": "auth.login.failed",  "actor_id": "u_8814",  "source_ip": "203.0.113.44",  "reason": "invalid_password",  "trace_id": "9f2c1b..."}
Stable field names are what make detection rules maintainable. Never log credentials or tokens.

Best practices

  • Log auth, authorisation and configuration changes at minimum.
  • Redact sensitive fields at source.

Common mistakes

  • Logging request bodies containing credentials or personal data.