Tutorials System Design Tutorial
Logging Architecture — Complete Guide
Logging Architecture — Complete Guide: free step-by-step lesson with examples, common mistakes, and interview tips — part of System Design Tutorial on Toolliyo Academy.
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System Design Tutorial · Lesson 66 of 100
Logging Architecture
Basics ✓ → Scale → Interview
Scale · 2 — Distributed · ~10 min · Module 7: Security and Observability
What is this?
Logging architecture standardizes structured logs, correlation IDs, retention, and shipping to a searchable store.
Why should you care?
ShopNest incidents need “show me all logs for request X across services” in seconds.
See it live — copy this example
Sketch the architecture on paper. These lessons focus on concepts and trade-offs.
{ "ts":"...", "level":"INFO", "service":"orders", "request_id":"...", "msg":"placed", "order_id":9001 }
Ship → OpenSearch/ELK/Cloud logs
PII scrubbing before ship
Retention: 14–30d hot; longer cold if requiredRun Example »
Edit the code below and click Run to see the result in Toolliyo’s live editor.
What happened?
- JSON fields beat free text.
- request_id ties the mesh together.
- Scrub secrets/PII.
- Retention balances cost vs forensics.
Practice next
- Adopt structured logs in ShopNest services.
- Propagate request_id.
- Centralize search.
- Add order_id as a first-class field.
- Alert on error spikes by service.
Remember
Structured + correlated. Central search. Scrub PII/secrets.
request_id across ShopNest
Support pastes an id and sees gateway→order→pay logs.
Outcome: MTTR drops on checkout incidents.
Interview prep for this lesson
Practice these questions aloud after reading—each links to a full structured answer.
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