While debugging an issue with a partner, I asked them to turn on debug=True for Nova to collect some more information.  After collecting the debug log file from the compute node, I noticed that over 70% of the log file was taken up with entries like this:

2014-04-06 03:25:46.039 125211 DEBUG iso8601.iso8601 [-] Got u'2014' for 'year' with default None to_int /usr/lib/python2.6/site-packages/iso8601/iso8601.py:124
2014-04-06 03:25:46.039 125211 DEBUG iso8601.iso8601 [-] Got u'04' for 'month' with default None to_int /usr/lib/python2.6/site-packages/iso8601/iso8601.py:124
2014-04-06 03:25:46.039 125211 DEBUG iso8601.iso8601 [-] Got u'04' for 'day' with default None to_int /usr/lib/python2.6/site-packages/iso8601/iso8601.py:124
2014-04-06 03:25:46.040 125211 DEBUG iso8601.iso8601 [-] Got u'01' for 'hour' with default None to_int /usr/lib/python2.6/site-packages/iso8601/iso8601.py:124
2014-04-06 03:25:46.040 125211 DEBUG iso8601.iso8601 [-] Got u'54' for 'minute' with default None to_int /usr/lib/python2.6/site-packages/iso8601/iso8601.py:124
2014-04-06 03:25:46.040 125211 DEBUG iso8601.iso8601 [-] Got u'55' for 'second' with default None to_int /usr/lib/python2.6/site-packages/iso8601/iso8601.py:124
2014-04-06 03:25:46.040 125211 DEBUG iso8601.iso8601 [-] Parsed 2014-04-04T02:00:44Z into {'tz_sign': None, 'second_fraction': None, 'hour': u'02', 'tz_hour': None, 'month': u'04', 'timezone': u'Z', 'second': u'44', 'tz_minute': None, 'year': u'2014', 'separator': u'T', 'day': u'04', 'minute': u'00'} with default timezone <iso8601.iso8601.Utc object at 0x2052e90> parse_date /usr/lib/python2.6/site-packages/iso8601/iso8601.py:166


This output is overly verbose and not useful.  It should be disabled by default.    RHOS 5.0 already has this disabled by default, so it would be helpful to backport this particular change to RHOS 4.0.

The change is to add "iso8601=WARN" to the default list of values of the config option "default_log_levels".