snmp log

Normally, this issue is seen when you make changes to SNMP configs. You need to restart snmpd process use the following;

tmsh restart sys service snmpd

There is solution article available for this issue;

https://support.f5.com/kb/en-us/solutions/public/k/70/sol70991237.html

But this article applies to some code version only (Check "Applies to: Show Version" on upper right corner of the article)