I am running multiple pollers, and we just noticed that the discovery of new hosts is not doing what we would expect when trying to partition the workload. Instead of doing a third of the new hosts, it does a third of all the hosts, essentially doing a full discovery, which is causing some our PDU’s to get overloaded, since they are being hit by 3 parallel discoveries and also possibly a poll at the same time.
/opt/observium/observium-wrapper discovery --host new -i 3 -n 0
If I remove the -i and -n options, then it does what I would expect, although it is not distributed, which isn’t a problem because the number of new devices should be pretty small. So the --host and the -i and -n options appear to be mutually exclusive, which isn’t stated in the help at all.