logging
2 free lessons tagged logging across Business, Programming. Each one is a short sequence of focused steps with narration and a five-question quiz at the end — take them in any order, no signup required.
Assignment, Exposure, and the Smoke Detector Called SRM
Most wrong experiment results are not statistical subtleties; they are plumbing. This lesson covers how assignment actually works, hashing, not coin flips, why exposure must be logged at the moment of treatment, and the sample ratio mismatch check: the humble comparison of observed to expected group sizes that catches more broken experiments than any other single test.
Metrics, Logs, Traces: Three Signals, Three Cost Models
Observability is not a product you buy but a property your system has: can you explain a behaviour you did not predict? This lesson defines the three telemetry signals, what question each answers, why their costs grow along completely different axes, and why the difference between monitoring and observability is the difference between known and unknown failure modes.