The issue is reproducible only on custom 10.0 build with ubuntu xenial which probably contains newer version of oslo_log library.
All other fuel releases haven't been affected by it due to the fact that fuel-agent uses obsolete and stailed part of oslo_incubator's log.py which behaves in the following way:
The message will not be logged because a string formatting exception will occur. it just silently ignores the error and continues to work further with no visible side effects.
The issue is reproducible only on custom 10.0 build with ubuntu xenial which probably contains newer version of oslo_log library.
All other fuel releases haven't been affected by it due to the fact that fuel-agent uses obsolete and stailed part of oslo_incubator's log.py which behaves in the following way:
The message will not be logged because a string formatting exception will occur. it just silently ignores the error and continues to work further with no visible side effects.