⎈ Guided Lessons

No slides, no walls of text — each lesson drives a live simulation and only moves on when you've watched the thing actually happen.

⎈ Kubernetes

Why scaling is never instant

Load → CPU → HPA math → startup delay → stabilization. The whole autoscaling chain, live.

8 steps · ~4 min →

Requests vs limits — feel the difference

Trigger real CFS throttling, watch p99 melt while everything stays "Running", then heal it.

5 steps · ~3 min →

📨 Kafka

Consumer lag, skew & rebalancing

Outrun your consumers, pay the rebalance tax, then meet the hot key that no fleet can fix.

7 steps · ~4 min →

🌩 Resilience

Anatomy of a retry storm

Cause a self-inflicted outage with three "reasonable" settings, then cut the loop with a circuit breaker.

7 steps · ~4 min →

Prefer free play? Head to the playgrounds · test yourself in the Daily Incident 🗓