For example: build_useroverride_db: Unable to find user/group from entry
These messages are there to advise that there is an issue with an entry in:
group-override, user-override or users.allow, users.deny
Enhancement Request #767864 has been raised to include a product feature to suppress users allowed/override syslog messages for situations in which the issue causing the messages cannot be corrected in a timely manner.
As of this writing (April 18th 2018) this feature is not yet in the product. Check the changelog file included with each new release of Authentication Services for the inclusion Enhancement Request #767864.