How to debug SNMP?

Is there a way to get traces for SNMP sensors?

For some reason, the SNMP sensors stopped to work, but I can’t get any debug log about this feature.

I set up:

default: debug
zeroconf: fatal

in configuration.yaml, but the only SNMP-related info I can read is
INFO Setting up sensor.snmp
which does not help much.

How can I get details about the SNMP requests made on remote devices?