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The 'msg' in SysLogHandler does not correspond to MSG in RFC.
Nor to %(message)s in log record.
RFC:
------------------------
SYSLOG-MSG = HEADER SP STRUCTURED-DATA [SP MSG]
HEADER = PRI VERSION SP TIMESTAMP SP HOSTNAME
 SP APP-NAME SP PROCID SP MSGID
PRI = "<" PRIVAL ">"
[...]
MSG = MSG-ANY / MSG-UTF8
MSG-ANY = *OCTET ; not starting with BOM
MSG-UTF8 = BOM UTF-8-STRING
BOM = %xEF.BB.BF
--------------------------------
logging:
The SysLogHandler does not provide any fields after PRI.
Which is OK, those can be added via format string.
We are using following formatter to get RFC-like structure
to message:
 [formatter_syslog]
 format=%(hostname)s %(service_name)s %(job_name)s %(message)s
That's not fully compliant, but that's beside the point.
The problem is that SysLogHandler puts BOM before hostname
not before %(message)s. In Python 2.6 it put it even before PRI,
which was even more annoying.
I see 2 solutions to this:
1) Stop putting BOM at all, its not necessary.
2) Put the BOM into %(message)s somehow, thus working with whatever
format is given.