oslo.log commit 27f7fe52fefcb81c5fe01736841d7a20149caf02 changed the
"logging_exception_prefix" config option to use the ERROR rather than
TRACE level which breaks multi-line queries in logstash.o.o, which is
kind of a big deal for elastic-recheck to not have super generic
queries.
This makes the log level an OR for TRACE or ERROR for versions of
oslo.log used in stable branches and ERROR for master.
This should behave OK otherwise because of the %{NUMBER} in the pattern
where NUMBER corresponds to the pid in logging_exception_prefix:
%(asctime)s.%(msecs)03d %(process)d ERROR %(name)s %(instance)s
Closes-Bug: #1474545
Change-Id: Iddd7f51b6a57deb6d56fc9f702992e7b14cf5cde
23e70213f2