High p99 Latency in Go Service: Identifying and Resolving Bottlenecks to Prevent System Overload

Introduction: The Latency Challenge In distributed systems, p99 latency often emerges as the silent killer of performance, despite healthy p50 and p95 metrics. This phenomenon is particularly acute in Go services, where the request lifecycle—from client initiation to load balancer routing and service processing—can be disrupted by straggler requests. These stragglers, consuming disproportionate resources, act as systemic bottlenecks, delaying subsequent requests and cascading into d