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Observability

System observability, monitoring, logging, tracing, and metrics for understanding application behavior and diagnosing issues in production.

1 article·Page 1 of 1

A clean dashboard-style illustration of QPS, TPS, Concurrency, and Response Time connected by a simple formula.

MethodicalFunction.com

Series: System Performance Metrics Every Engineer Should Know (Part 1)

System Performance Metrics Every Engineer Should Know: QPS, TPS, Concurrency, Response Time

December 23, 2025·byJoshua Morris

A practical guide to the four metrics that explain why your API feels slow, plus a tiny demo API implemented across popular stacks with real measurement queries.

PerformanceObservabilityBackend