Go Garbage Collector Mechanics: Pacer, GOGC, and Allocation Latency

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In the world of high-throughput backend services, we often obsess over the usual suspects of performance: database indexing, network latency, and algorithmic complexity. But recently, while debugging our core gateway service ( backend-gw ), I encountered a bottleneck that defied standard logic. The service was CPU-bound , yet active heap usage was surprisingly low (~200MB). P99 latency was spiking…

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