Problem:
Message every 30 seconds in /var/log/syslog
error on subcontainer 'ia_addr' insert (-1)
Solution:
Turn off debug logging
for i in /etc/systemd/system/multi-user.target.wants/snmpd.service /etc/default/snmpd;
do
sed -i "s|-Lsd|-LS6d|" $i;
done