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    >>> j.add_match(_SYSTEMD_UNIT="systemd-udevd.service")
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        journal files of system services and the kernel.

        Argument `path` is the directory of journal files. Note that
        `flags` and `path` are exclusive.

        Argument `converters` is a dictionary which updates the
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        be single argument functions, which take a `bytes` object and
        return a converted value. When there's no entry for a field
        name, then the default UTF-8 decoding will be attempted. If
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dS(s�Add match for _BOOT_ID equal to current boot ID or the specified boot ID.

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        >>> stream = journal.stream('myapp')
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          PRIORITY=7
          SYSLOG_IDENTIFIER=myapp
          MESSAGE=message...

        Using the interface with print might be more convinient:

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        >>> print('message...', file=stream)

        priority is the syslog priority, one of `LOG_EMERG`,
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        >>> log.propagate = False
        >>> log.addHandler(journal.JournalHandler())
        >>> log.warn("Some message: %s", detail)

        Note that by default, message levels `INFO` and `DEBUG` are
        ignored by the logging framework. To enable those log levels:

        >>> log.setLevel(logging.DEBUG)

        To redirect all logging messages to journal regardless of where
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        >>> logging.root.addHandler(journal.JournalHandler())

        For more complex configurations when using `dictConfig` or
        `fileConfig`, specify `systemd.journal.JournalHandler` as the
        handler class.  Only standard handler configuration options
        are supported: `level`, `formatter`, `filters`.

        To attach journal MESSAGE_ID, an extra field is supported:

        >>> import uuid
        >>> mid = uuid.UUID('0123456789ABCDEF0123456789ABCDEF')
        >>> log.warn("Message with ID", extra={'MESSAGE_ID': mid})

        Fields to be attached to all messages sent through this
        handler can be specified as keyword arguments. This probably
        makes sense only for SYSLOG_IDENTIFIER and similar fields
        which are constant for the whole program:

        >>> journal.JournalHandler(SYSLOG_IDENTIFIER='my-cool-app')

        The following journal fields will be sent:
        `MESSAGE`, `PRIORITY`, `THREAD_NAME`, `CODE_FILE`, `CODE_LINE`,
        `CODE_FUNC`, `LOGGER` (name as supplied to getLogger call),
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