Below you can see the full work example for logstash.conf file

There are grok patterns for:
Nginx:
* access.log
* error.log
Tomcat:
* site.log
* localhost.log

• site_access_log.txt

$ systemctl stop apt-daily.timer
$ systemctl disable apt-daily.timer
$ systemctl mask apt-daily.service
$ systemctl daemon-reload

check current status

golang.org rate limiter:

	rl := rate.NewLimiter(1000000, 1)
 
	last := time.Now()
	for i := 0; i < 10; i++ {
		rl.Wait(context.Background())
		cur := time.Now()
		fmt.Println("last", cur.Sub(last))
 last = cur