I've been using Observium at work to collect and graph SNMP logs for a couple years now. A while back the graphs started showing "Draw Error" instead of the actual graph. I poked at it a bit, but never got it fixed. I wasn't too worried since I want to use the ELK Stack for most of what Observium does in the future. Today, though, a coworker came and asked about Observium. So I decided to poke at it some more.