Problem with your document (https://www.openbmp.org/getting_started.html)

[Creammilky]

In your document:
...
mkdir -p ${OBMP_DATA_ROOT}/grafana

chmod -R 7777 $OBMP_DATA_ROOT/* --> this line may cause very serious problem with archlinux-zsh
...

Don't forget braces, change it to:
"chmod -R 7777 ${OBMP_DATA_ROOT}/*"

All my files that I own changed their priv to 7777, that sucks.