How did you deal with goroutine leak — did you monitor it?

A goroutine leak occurs when goroutines remain in a waiting or blocked state and do not terminate, leading to memory and resource leaks. To combat this, it is important to:

• Use contexts (context.Context) to manage the lifetime of goroutines and cancel their work.
• Monitor channels: close them properly and avoid blocking when sending/receiving.
• Monitor the number of active goroutines using runtime.NumGoroutine().
• Use profiling with pprof to identify goroutines that do not terminate.

Example of monitoring the number of goroutines:

package main

import (
    "fmt"
    "runtime"
    "time"
)

func main() {
    go func() {
        select {} // blocking goroutine
    }()

    time.Sleep(time.Second)
    fmt.Printf("Active goroutines: %d\n", runtime.NumGoroutine())
}

Regular monitoring and profiling help to detect and eliminate goroutine leaks in a timely manner.