The RED Method: Request Rate, Errors, and Duration as Your Core SLIs

"Noise drowns out signal; focus on the three metrics that actually indicate system health." What We're Building We are instrumenting a Go-based HTTP handler to expose the three Request Rate, Errors, and Duration metrics required to calculate Service Level Indicators (SLIs). This scope excludes internal tracing spans or database metrics, focusing strictly on the surface API gateway to ensure consistency across a distributed backend. The goal is to replace legacy monitoring scripts with a structur