Have you worked with performance metrics? What did you encounter?

Yes, I have worked with performance metrics in Golang. I usually used the standard pprof package for profiling CPU, memory, and locks. I also used external monitoring systems, such as Prometheus, for collecting and visualizing metrics in real-time.

Examples of metrics I encountered:

• HTTP service response time
• Number of goroutines and their state
• Memory usage and garbage collection
• Business logic metrics (e.g., number of processed requests)

Example of pprof integration:

import (
    "net/http"
    _ "net/http/pprof"
)

func main() {
    go func() {
        log.Println(http.ListenAndServe("localhost:6060", nil))
    }()
    // rest of the application code
}

This allows connecting to the application and obtaining profiles for analysis.