Shockingly enough out of the box Zabbix (version 6) does not include any template to monitor a very crucial compontent every organization: DNS.
Like most open source aficionado my DNS of choice is BIND named.
Luckily Zabbix has a pretty huge community and plenty of templates for it are freely available, a quick search on the interwebz lead me to this page.
Kudos to whoever wrote this template, I just took it and tweaked it a little bit.

BIND named configuration

named needs to have statistics-channels enabled:

$ less /etc/bind/named.conf.options

...
statistics-channels {
  inet 127.0.0.1 port 8080 allow {
    127.0.0.1;
  };
};
...

Also make sure to enable zone-statistics for the zones for which we would like to gather statistics:

less /etc/bind/named.conf.local

...
zone "..." {
  ...
  zone-statistics yes;
  ...
};
...

Zabbix Agent2 configuration

Now that we have told named to expose statistics we need to instruct Zabbix Agent2 (or legacy Zabbix Agent) to pick them up:

$ apt install xml2 curl -y
$ cat /etc/zabbix/zabbix_agent2.d/bind.conf

---
UserParameter=bind.net.udp,netstat -nua | grep :53 | wc -l  
UserParameter=bind.net.tcp,netstat -nta | grep :53 | wc -l  
UserParameter=bind.queries.in[*],curl http://127.0.0.1:8080/ 2>/dev/null | xml2 | grep -A1 "/statistics/server/counters/counter/@name=$1$" | tail -1 | cut -d= -f2  
UserParameter=bind.queries.out[*],curl http://127.0.0.1:8080/ 2>/dev/null | xml2 | grep -A1 "/statistics/views/view/counters/counter/@name=$1$" | tail -1 | cut -d= -f2  
UserParameter=bind.queries.query[*],curl http://127.0.0.1:8080/ 2>/dev/null | xml2 | grep -A1 "/statistics/server/counters/counter/@name=Qry$1$" | tail -1 | cut -d= -f2
---

$ systemctl restart zabbix-agent2

Zabbix Server configuration

Finally we need to import the template into Zabbix Server (version 6 LTS in my case).
Login into Zabbix WEB UI, navitage Configuration -> Templates and click the Import button on the top right of the page.
Download the template file and import it.
Last thing left to do is enable the template DNS-bind on all DNS hosts in Zabbix Server.
After a few seconds data should start to show up in Zabbix.