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01 ·Cloud & Ops·★ MEMBER·10 min read Observability — Logs, Metrics, and Traces in Practice When the phone rings at 3 a.m., can you answer without logging into production and looking around? Starting from zero, this piece builds up structured logging, metric cardinality, trace context propagation, and SLOs with error budgets — then lines them all up as a single motion: notice, narrow, confirm.