Have you ever set up monitoring and metrics collection systems?

Yes, I have configured monitoring and metrics collection systems. This usually involves:

• Choosing tools for metrics collection (e.g., Prometheus, Grafana, or built-in Go libraries).
• Integrating metrics into the application using client libraries.
• Setting up exporters and agents to collect data from servers.
• Configuring dashboards for visualization and alerts for notifications.

An example of simple metrics collection in Go using Prometheus:

import (
    "github.com/prometheus/client_golang/prometheus"
    "github.com/prometheus/client_golang/prometheus/promhttp"
    "net/http"
)

var opsProcessed = prometheus.NewCounter(prometheus.CounterOpts{
    Name: "myapp_processed_ops_total",
    Help: "The total number of processed events",
})

func init() {
    prometheus.MustRegister(opsProcessed)
}

func main() {
    http.Handle("/metrics", promhttp.Handler())
    go func() {
        for {
            opsProcessed.Inc()
            time.Sleep(time.Second)
        }
    }()
    http.ListenAndServe(":2112", nil)
}

This allows collecting and viewing metrics in Prometheus.