Goroutine

Answer-first: Production Go concurrency patterns: errgroup worker pools, semaphore-based rate limiting, bounded queues, and graceful backpressure for microservices. Every Go engineer eventually writes the same mistake: a loop that launches goroutines unconditionally. In a demo with 10 items, this works beautifully. In production with 50,000 incoming webhook events, it spawns 50,000 goroutines simultaneously, exhausts memory, and triggers the OOM killer. Kubernetes restarts the pod. The on-call engineer gets paged at 3 AM. ...

Answer-first: Learn how to detect, diagnose, and fix goroutine leaks in production Go microservices using pprof, goleak, and the new Go 1.26 goroutineleak profile. A Kubernetes pod abruptly restarts with exit code 137. The memory metrics dashboard shows a slow, perfectly linear staircase pattern stretching over three days. There are no panic logs in stdout, no database errors, and no abnormal CPU spikes. Just a slow, silent OOM (Out Of Memory) death. ...