A Practical Guide to Implementing Google's Four Golden Signals in Production

Google's SRE framework defines four golden signals — Latency, Traffic, Errors, and Saturation — as the core metrics for monitoring service health. A practitioner with experience across 50+ services outlines common implementation pitfalls, such as relying on average latency instead of percentile-based tracking separated by status class. The guide recommends alerting on p99 latency, monitoring traffic drops as carefully as spikes, and measuring error rate as a percentage rather than an absolute count. Saturation — covering CPU, memory, connections, and queue depth — is highlighted as the most underrated signal, with alerts recommended at 80% and 95% thresholds. A standardized four-row dashboard template is proposed so any engineer can assess service health at a glance without building per-service dashboards manually.