ansible-hardening/doc/source/developer-notes/V-38660.rst

Although neither Ubuntu 14.04 or openstack-ansible install or configure the SNMP daemon by default, the Ansible tasks will check to see if the SNMP configuration file is present. If the file is present, and the file contains configurations for insecure SNMP protocols, an error will be printed and the playbook will fail.

The task specifically looks for uncommented configuration lines containing:

• v1
• v2c
• com2sec
• community

Red Hat's guide to SNMP has some example configurations that deployers can use to enable SNMPv3.