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Don't use widget.description as kwarg key...
Don't use widget.description as kwarg key in interact. description can be set manually, so it cannot be relied upon to store the kwarg key. Add a `widget._kwarg` attribute instead.

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logtopics.rst
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Log Topic Specification

we use pyzmq to broadcast log events over a PUB socket. Engines, Controllers, etc. can all broadcast. SUB sockets can be used to view the logs, and ZMQ topics are used to help select out what to follow.

the PUBHandler object that emits the logs can ascribe topics to log messages. The order is:

<root_topic>.<loglevel>.<subtopic>[.<etc>]

root_topic is specified as an attribute