https://hub.docker.com/r/mbixtech/observium/

Great for small and large scale networks, add devices by entering ip and snmp credentials and all done.

Add alerting if that's your cup of tea.

Observium is an easy starting point for network gear, without going down the Zabbix rabbit hole.

Personally I just roll Victoriametrics and Grafana.

You couldn't pay me to use observium. The lead dev is one of the worst persons I've seen online. His behaviour towards people asking basic questions is absolutely horrible.

LibreNMS 100%

Context - https://www.reddit.com/r/networking/comments/3eee3e/librenms_vs_observium/

LibreNMS is better as is the treatment you'll receive from the devs compared to the observium devs.

Context - https://www.reddit.com/r/networking/comments/3eee3e/librenms_vs_observium/

LibreNMS, which is a modern fork of observium.

https://roguesecurity.dev/blog/librenms

and has integration for Oxidized, smokeping, greylog and more

Love me some graylog

Well, switched from check_mk to librenms this morning. and indeed, it's a much better fit. Much more network oriented compared to many other tools.