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bump pyzmq version dependency to 13...
bump pyzmq version dependency to 13 pyzmq < 13 doesn't work with tornado >= 3, which we also require. This results in clearer error messages when pyzmq is too old.

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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