Because it just works. Grafana requires a lot of work to set up, especially if you want to do it in a secure way and provision it programmatically. Munin on the

Because it just works. Grafana requires a lot of work to set up, especially if you want to do it in a secure way and provision it programmatically. Munin on the other hand is just an apt-get install plus some minor configuration. Yes, it is not as powerful but on the other hand it is much eaiser to set up correctly.