Logging

0 lessons

1 system design

4 community items

logging

System Design

1 article

Monitoring, Logging, Alerting & SLAs

Observability is what lets you know whether your system is working before customers do. This lesson covers the three pillars (metrics, logs, traces), the SRE-grade definitions of SLI / SLO / SLA, and the operational practices that turn raw telemetry into actionable alerts (RED method, USE method, error budgets, alert fatigue control). We tour the standard production stack (Prometheus, Grafana, OpenTelemetry, ELK, Datadog) and the pitfalls that cause teams to either drown in alerts or miss real incidents. By the end you can design an observability strategy and defend it in an interview against the question 'how would you know if this system was broken?'.

474

Community

4 items

Article

Metrics, Logs, and Traces: The Three Pillars Without the Marketing

What each pillar actually does, when reaching for it pays off, and the budget I follow so I am not paying observability vendors more than I am paying for compute.

313

4.4 (9)

May 17, 2026

by @zarakamau

Code Snippet

ANSI Colored Logger in 50 Lines

chalk is great. chalk plus chalk-template plus log-symbols plus signal-exit is heavy. Here is the dependency-free ANSI logger I drop into every Node script when I want one-line wins without 14 transitive packages.

1.1k

4.2 (11)

May 12, 2026

by @carlosherrera

Code Snippet

A Tracer Decorator With Arg Redaction (Python)

A `@trace()` decorator I bolt onto Python services when the production logs go quiet at the wrong layer. Logs entry, exit, duration, and exceptions, with secret-arg redaction baked in.

862

4.4 (12)

Mar 17, 2026

by @elisehuang

Code Snippet

A Request/Response Logger That Does Not Leak Secrets

The redact-by-key logger I add to every Node service before it touches production logs. Catches headers, JWTs, card numbers, and Stripe keys without paying for a SIEM scrubber.

434

4.4 (15)

Mar 6, 2026

by @nadiaali