On Jun 30, 2018, at 13:25 , Mike Stupalov <mike@observium.org> wrote:

update your system, this old-old net-snmp issue.. probably you use Centos 6 or something same old..

I already had the discovery.php -u as part of the update script.

And I’m on the latest version of Ubuntu 16.04

Why it manifested now I don’t know but once I found it, I fixed it with 

sudo rm -rf /var/lib/snmp/mib_indexes/*

sudo rm -f /opt/observium/mibs/*/.index

sudo rm -f /opt/observium/*/.index

Interestingly enough, there were no .index files under /opt/observium but there were some in /var/lib/snmp/mib_indexes

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