connpool: A Zero-Alloc TCP Connection Pool for Go

The Story Years ago, when I first needed TCP connection pooling in Go, I found fatih/pool. It was elegant, simple, and it taught me a lot about channel-based pooling design. It was a real inspiration. But as I worked on high-throughput systems at scale, I kept running into gaps: no health checks, no idle eviction, no lifetime management, no metrics. I'd bolt these on as wrappers, and eventually realized I was maintaining a full pool implementation anyway. So I built connpool — takin