What are the main system indicators you know and can use for resource monitoring?

Key system metrics for resource monitoring:

• CPU Usage: percentage of CPU utilization, helps identify overloads.
• Memory Usage: amount of used and free RAM.
• Disk I/O: read/write speeds, delays.
• Network I/O: volume of data transmitted and received, error count.
• Load Average: average system load over a specific period.
• Number of Goroutines (for Go): number of active goroutines, may indicate leaks.
• Garbage Collection metrics: time and frequency of garbage collections.

In Go, you can use the runtime package to get information about goroutines and garbage collection:

import (
    "fmt"
    "runtime"
)

func printStats() {
    var m runtime.MemStats
    runtime.ReadMemStats(&m)
    fmt.Printf("Goroutines: %d\n", runtime.NumGoroutine())
    fmt.Printf("Alloc = %v MiB\n", m.Alloc / 1024 / 1024)
    fmt.Printf("TotalAlloc = %v MiB\n", m.TotalAlloc / 1024 / 1024)
    fmt.Printf("Sys = %v MiB\n", m.Sys / 1024 / 1024)
    fmt.Printf("NumGC = %v\n", m.NumGC)
}