First I got the issue that eth0-traffic graph was enabled but not generated – for this I found this patch: https://github.com/mail-in-a-box/mailinabox/issues/896. I also set the speed to 1000 Mbit (which is shared by digitalocean hostsystem) because my servers also returned -1 at cat /sys/class/net/eth0/speed.
Ubuntu VPS Hosting via Munin-Graph for “eth* traffic” gets into negative values.… More