SLOs & Error Budgets

Failure modes and blast radius, SLOs and error budgets, the three signals of observability, the retry patterns that cause outages rather than preventing them, and shipping a schema change without downtime.

This module is 06.2 of the 5 in Reliability & Operations. It runs about 3 hours across 5 lessons, and closes with Budget — Spend a quarter of error budget across features, incidents and migrations without running out in month two.