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        Log an event.

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            key beginning with the prefix C{"log_"}; applications should not
            use any key so named.  Currently, the following keys are used by
            the logging system in some way, if they are present (they are all
            optional):

                - C{"log_format"}: a PEP-3101-style format string which draws
                  upon the keys in the event as its values, used to format the
                  event for human consumption.

                - C{"log_flattened"}: a dictionary mapping keys derived from
                  the names and format values used in the C{"log_format"}
                  string to their values.  This is used to preserve some
                  structured information for use with
                  L{twisted.logger.extractField}.

                - C{"log_trace"}: A L{list} designed to capture information
                  about which L{LogPublisher}s have observed the event.

                - C{"log_level"}: a L{log level
                  <twisted.logger.LogLevel>} constant, indicating the
                  importance of and audience for this event.

                - C{"log_namespace"}: a namespace for the emitter of the event,
                  given as a L{str}.

                - C{"log_system"}: a string indicating the network event or
                  method call which resulted in the message being logged.
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