This means that the poller is not completing in 5minutes consistently. Check your poller logs and performance graph. It could be that you added enough devices to exceed your hardware or a firmware update reduced the performance of SNMP on the device.
I’ll look through all this and see what I can find, but literally, the only change made was the recent LibreNMS auto update. There have been no devices added for over a month. These gaps are appearing on graphs are from multiple devices, a pfsense firewall, a Synology NAS, a wifi access point etc.
Hard to believe that they all instantly, over night, started having issues. Only common factor is the recent LibreNMS update.
LibreNMS is running in a VirtualBox VM if that makes any difference.
So I rolled back to the previous version, “6ff3ae8 - Thu Jan 12 2017 21:47:13 GMT-0800” (I’ve turned off the auto updates) and as you can see the data gaps have gone away. I changed nothing else on my network, the only difference is the update in to LibreNMS itself.
So with that option enabled we do a lookup to the google api to translate addresses to geo coords. I’m guessing your install has no external access or at least has an issue connecting to the google api.
We have a pr in the queue which adds timeouts to these calls so it would be less impactful for the future.